You'll have seen his posters slapped on walls across the city centre - from penis enlargement ads to swipes at Primark.

Birmingham poster prankster Foka Wolf, who has drawn comparisons to Banksy with his art work, has become renowned across Birmingham for his spoof adverts, which have been lauded by city residents.

The anonymous Birmingham-based artist boasts a staggering social media following, with well over 10,000 followers on Instagram, where he routinely shows off his latest efforts.

Not much is known about the mystery artist - but "they" (Foka Wolf has been identified as male and female in various media reports) told the Evening Standard their secrets last year.

Foka Wolf explained: “I had a roll of stickers I used to draw faces on. One day when I was severely hungover I began just writing jibberish adverts on them.

“I enjoyed the process, so continued."

Over the months, the artist has lampooned Birmingham's new Primark store, which opened in April, and plonked a cardboard ‘police robot unit’ outside a city centre station.

The cardboard box featured a poster with a huge robot on it with four bullet points including the description “no empathy”.

His previous posters have involved fake ads for penis extension surgery for 4x4 drivers and medical trials to grow "23 pairs of ears" on the backs of students .

Foka Wolf also made headlines with a string of poster pranks including mocking Range Rover drivers .

These are Foka Wolf's greatest hits:

Sign offering penis enlargement ‘is a dig at 4x4 drivers’

A huge poster was erected on a wall in Birmingham offering free penis enlargement therapy for drivers of certain types of vehicle.

The sighting on Sherlock Street in the city centre, was first spotted on Sunday, April 15, much to the astonishment of passers-by.

It was believed that the sign is a poke at 4x4 drivers in a bid to trick them to call an unrecognised phone number.

Onlooker @F1_Jamie86 told Birmingham Live on Twitter: “I stopped on my bike. There was a big RAV4 thing parked next to me at the traffic lights. I just grinned at him.”

Bizarre offer to students

The poster prankster who offered penis extensions to 4x4 drivers was back in April 2018 - with a spoof ad targeting cash-strapped students.

Advertised as a "medium-risk" procedure, the poster urges undergraduates: "Let us grow 23 pairs of ears on your back for 6 months. Safety tested, good price."

A telephone number for "Weldon Medical" is also listed - the same number that appeared on the 4x4 ad in Birmingham city centre last week.

The latest poster has appeared on the busy New Canal Street, near to Moor Street Station and Eastside Park.

The black and white sign, which includes a cropped out ear, reads: "STUDENTS! NEED CA$H

Become part of a medical research experiment today. Let us grow 23 pairs of ears on your back for 6 months. Safety tested, good price, medium risk."

Street artist, Foka Wolf, has claimed the stunt as their own.

A spokesperson for the artist wrote: "It's something this organisation has put up yes.

When asked why, the spokesperson added: "I am bored of being bombarded with corporate messages so I've invented my own advertising agency."

Voodoo lessons for kids

The notorious poster prankster who entertained Brummies with spoof ads struck again in May 2018 - with an offer of Voodoo classes for kids.

The advert reads "Make Dolls! Curse friends! Perform blood sacrifices!" and has the phone number 0121 318 8805 along the bottom.

A picture of children running and a Voodoo doll hovering above them dominates the sign, placed by Moseley's Russell Road car park.

Adding another level of sarcastic humour to the stunt is the sticker for Birmingham City Council Leisure and Culture pasted across the top of the notice board.

BirminghamLive asked Foka Wolf why they put up the controversial posters after the last sign was spotted.

A spokesperson said: "I am bored of being bombarded with corporate messages so I've invented my own advertising agency."

Spoof police robot 'with no conscience' left outside station

Foka Wolf then poked fun at West Midlands Police by plonking a cardboard ‘police robot unit’ outside a city centre station.

The mock box was spotted by onlookers outside Digbeth Police Station - with locals in the city branding Foka Wolf’s latest prank as their “best work yet”.

In a Facebook post , Foka Wolf quipped: “New delivery at Digbeth police station…”

The cardboard box featured a poster with a huge robot on it with four bullet points including the description “no empathy”.

The mock brand - Megacorp - also has the slogan “profit before people”.

It was placed both directly outside the police station on Digbeth High Street and where officers enter the building on Allison Street.

The Facebook post has had more than 500 reactions.

Dan Brown commented: “Waiting for reports of a controlled explosion on a suspicious box by a police bomb disposal robot.”

While Foka Wolf replied: “This robot would beat the bomb disposal robot hands down.”

And Nigel Cracknell simply put: “Best one yet.”

It has been claimed the police robot prank relates to a job ad posted by West Midlands Police.

The force was looking for two Robotic Process Automation Developers with salaries between £27,795 and £38,925.

Candidates had to have “an interest and knowledge of the theory behind automation techniques, RPA software and artificial intelligence”.

The closing date was August 7.

Over-75s death match

Foka Wolf spoke to BirminghamLive after we dialled a number listed on his latest ad - for an "over-75s death match".

The poster, which appeared in Fore Street, Ladywood, said the bout would take place on a Poundstretcher car park in Acocks Green .

It read: "Behold the event of the year!

"Over 75s no rules deathmatch."

"Poundstretcher car park Acocks Green 23/01/19 - 9am till late.

"Weapons provided on the night.

"Enter your old person today."

Primark targeted

It creates huge queues for its knock-down fashion lines.

Now the world's biggest Primark store is open n Birmingham city centre.

But not everyone is a fan.

The giant store - being built on the site of the old Pavilions shopping centre - has been branded "Europe's biggest jumble sale" by city artist Foka Wolf.

Famed for his string of spoof posters advertising everything from penis extensions to new eyeballs, his latest work tells passersby: "Sift through a 20 foot high pile of worthless tat 22 hours a day 7 days a week for the rest of your life."

Tweeting a picture of the billboard, he appeared to take aim at the disposable nature of discount fashion, wring "#tat #landfill #singleuseplastic".

The store is the city's biggest shopping development of the year so far.

The poster on hoardings outside the near-complete super store states: "Opening 2019.

"Europes Biggest Jumble Sale!

"Sift through a 20 foot high pile of worthless tat 24 hours a day 7 days a week for the rest of your life."

A photo of the latest prank was posted on the Foka Wolf Facebook page - and followers were left in hysterics.

Dave Conroy posted: "Fantastic."

Olly MacNamee said: "Mega tat extravaganza!"

While Tony Warbuton put: "I shall avoid like the plague."

And Tim Mobbs said: "This needs to be pasted up every week - truly doing God's work!"