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Pretty much the same as 'Sucking Up' to someone, except based around the action of giving somebody anal sex.
"I can believe you bum up to him just because he has a nice car."
"Dave's bumming up to Celebrities again."
bum up by Tom Barnes February 14, 2008

heads down bum up 

Get to working hard after spending all day procrastinating from your Advertising coursework

Yes I'm talking to you
My friend needs to get her heads down bum up with this uni work so she can get to a concert tomorrow
heads down bum up by motyak April 22, 2017

shut yo bum ass up 

when u havin a bad day and some random person is talking to u abt random shit u don't even give two kharas abt
person 1 :hey did you know that jason and troy were making out today
person 2: shut yo bum ass up
shut yo bum ass up by sniffxy August 26, 2023

up the bum no babies

Up the bum, no harm done 

An expression conveying the convenience and lack of danger in conceiving children in Anal Intercourse
Man 1: I didn't want to get her pregnant, so I did her up her rear end!
Man 2: You know what they say: "Up the bum, no harm done!"

Up the Bum 

anal sex, and the prelude to an amusing rhyme which kids at school write on each others textbooks to get their friends in trouble:
up the bum, no harm done!

additions:
with a thumb, twice as fun!
with ya mum, watch me cum!
Up the Bum by me old fruity October 1, 2006