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
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
Get the I'll Put it your ass, like i put in your mummug. by Haze_X12 May 11, 2022
Get the Mum don’t love memug. 
by LewisThe420BlazeItDatBoi November 22, 2021
Get the bevvo’s mummug. 
Ya mum.
by lily_wrote_this December 20, 2010
Get the Ya mummug. 