This meaning is used for someone who want it to put in your ass, people who most commonly use this term really want it in the ass, the mum part is a way of saying the you have sexual relations with someone mother.
Someone: What are we going to do

You: I'll Put it your ass, like i'll put in your mum
Someone: OMG yess baby

I'll Put it your ass, like i put in your mum
by Daddybby November 14, 2019
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Baboons ass

A friend that acts like a asshole at a party and is jumping all over people like a baboon
Mike: wow ,that was some party last night wasn't it...
Jamie: yeh, but ngl simon was a baboons ass fucking twat ...
by Asheater July 17, 2016
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baboons ass

"damn gurl what happened to your lips?"

"oh i did the kylie jenner lip challenge"

"well you look like you have a baboons ass now"
by 3kk0 January 03, 2017
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Buttery Ass

According to some people on Call of Duty MW2 a person talking over another is someone who is or ha a buttery ass.
Last night on COD:

Guy 1: Yo you see what happened.....
(Interrupter)

Another Gamer: Hey can yall hear me.

Guy 2: Hey David hut your buttery ass up I can't hear.
by bcford17 November 04, 2010
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On April 25th everyone and their momma sock the shit outta this MARK ass Tyson. Eventually when you knock him so hard and gone not wanna have international Tyson day again. (And while beating him up step on his shoes)
Yoooo!its international beat Tyson’s ass day!

Yessssss let’s go. I’ve been training all year for this fooker to jawed.
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Flyswatter Ass

A girl's ass when she tries too hard to make it swish because they think it makes them look sexier.
DAMN! That chick has such a flyswatter ass! It's about to fall outta her booty shorts!
by AirplaneEatsSky June 14, 2011
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Sexy Beast Ass Nigga

Tevita Moala Kamitoni
When Tevita wears black shorts for lifting, he looks like a Sexy Beast Ass Nigga
by Lady Farquhar the 69th March 24, 2022
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