Mum Bum 

When a young girl has an ass like a 60 year old mother of 6.

I would've hit that, but her mum bum was mingin'

Mum Bum by Badmon22 September 16, 2011

mum bum 

a girl wit no ass, a saggy ass, or jus an ass that looks something like a 50 year old womans.

Steph shouldnt wear tight jeans because she has a mum bum and its discusting

mum bum by Sh@w_t@y June 28, 2006

Mum Bum 

The flattening and/or widening of the ass after child birth...

"Oh Look at her...thats a real mum bum..." or "Look at her she aint got no junk in that trunk, she got mum bum"....

well look at the bums of some moms and you'll see what we mean.... it's very obvious!!(looks like you've spent the last 3 days laying on your back and your ass is flattened...)

Mum Bum by 420 PPL October 17, 2008

bum your mum 

The act of having buttsex with a mother

"Go bum your mum!"

bum your mum by mmmm yummy yummy cummy cummy September 17, 2019

mum bummer 

The act of being overly nice and polite to the parents of friends/acquaintances, especially mothers, when you are in fact brash and filthy around your peers.

See also: dad spooner, granny grinder

We needed to leave but Kevin was busy being a mum bummer and we got there ten minutes late.

I'm wasn't mum bumming, she was just asking me all these questions.

mum bummer by barkbat October 22, 2009

Whatever [bums] your mum. 

When someone doesn't have the same point of view as you, you use this saying. Usually used in a sarcastic tone.

"Oh my God! Don't you just love watching hamsters piss!?!"

"Hmm, Whatever bums your mum."

Whatever [bums] your mum. by x_Lucie September 11, 2006

mumbum 

someones mum who is a legend.

"mumbums here"
"YAAAAAAY!"

mumbum by chloemayy June 8, 2009