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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To spoonfeed a bitch or whore or to fuck a sex toy with your middle finger.
I gave her so much money, it was my mistake that the middle up your ass!
The middle up your ass last night, and the results weren't pretty.
by Ranshiin X March 20, 2014
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One of the greatest insults in cinema history; Insult used by Scarface when he’s about to be chsinsawed.
Scarface: Why don’t you try sticking your head up your ass? See if it fits.
by SiL3Nt J September 30, 2023
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Slang for saying don’t do that, or it’s a bad idea
Friend- I wanna get wit my ex

Me- girl, get your ass in the car
by Bigbooty63 March 26, 2022
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