A term used in the UK when someone is desperately trying to convince you that their piece of information or version of events is correct to gain your trust but you know that they're blatantly lying through their teeth. Or someone is trying to sell you the latest designer object (watch, trainers, handbag etc.) and you can clearly see it's a fake. It's as genuine as a 40 pence piece. There is no such thing as a 40 pence piece in UK currency so if someone tried to give you one you'd know it wasn't real money.
A woman looking at handbags on Ebay: "oooo have you seen this lovely designer handbag it's only £10"
Friend: " narr mate it's a fake"
Woman: " it looks genuine to me"
Friend: " genuine! It's about as genuine as a 40 pence piece"
Or
A man after been told someone unreliable information: " rubbish! what a load of old tosh"
The informer: " narr mate it's absolutely genuine"
Man: "yeah about as genuine as a 40 pencepiece"
Friend: " narr mate it's a fake"
Woman: " it looks genuine to me"
Friend: " genuine! It's about as genuine as a 40 pence piece"
Or
A man after been told someone unreliable information: " rubbish! what a load of old tosh"
The informer: " narr mate it's absolutely genuine"
Man: "yeah about as genuine as a 40 pencepiece"
by hteb78 January 23, 2024
Get the As genuine as a 40 pence piecemug. One Piece has been serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump since July 1997, with its individual chapters compiled in 108 tankōbon volumes as of March 202412.The series follows the adventures of Monkey D. Luffy, a boy with rubber-like properties acquired by eating a Devil Fruit
by Sabo Fire Emperor April 27, 2024
Get the piecemug. by DracoCJM2 December 2, 2017
Get the train piecemug. Kaine W is a piece of shit
by asdfghjklsksksk March 30, 2020
Get the Piece of shitmug. by TheGeneralGenitalsPranksterian May 12, 2025
Get the <.7.9.7.6.>Paleomastodon Prime Piece primE paleomastodoN<.7.9.7.6.>mug. "Dude jerry let off a nasty ass three piece! Thats When somebody lets out three farts in a row, all in the same chain of farts"
by Hi my name is bubba123 September 1, 2025
Get the Three piecemug. The term "Cock-Twatlling-Piece-Of-Shit" is used when you want to express that someone is a "fucking piece of shit", but you want more pizzazz
by PitifulIris April 3, 2021
Get the Cock-Twatlling-Piece-Of-Shitmug.