look up any word, like bae:
 
1.
A common British variation of the American idiom 'yo momma' - usually used as a retort when one is insulted.
"You're such a big bell"

"Yer Mum's got such a big bell, I know 'cos I let it penetrate my ass."
by Tom Preston September 02, 2004
 
2.
1) One of the many phrases synomynous with the British chav due to their useage of the phrase.

2) A conversation filler or random answer to a question that is unknown, used in a mocking tone of the abforementioned chav
1) Chav: Inni man, like I saw yermum at MaccyDs da ova day

2) Normal Person 1: What's the date today?
Normal Person 2: Yermum
by Slumping Silhouette February 28, 2006
 
3.
British version of yo momma
I had yermum last night. Good, not great.
by Phinn October 07, 2003
 
4.
One annoying line invented by Tony Walsh (aka TDW) which was variation of yo mamma but with an British style to it. It also makes you feel like an idiot saying it as well.

Also managed to appear on Kerrang's Trash Idol.
Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum! Yer mum!
by Chris Ridsdill November 21, 2003