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A guy who has the back of his tousers covered in either cum or a cum looking substance. He decides not to change his trousers for ages and looks like a tramp to everyone.
Ewww! Cumbum change your trousers mate. youve had those on for 4 months now!
Cumbum by spunklover123 February 23, 2009
one with cum in their bum. or generally anyone i dont like
chris is a cumbum and sucks himself off
cumbum by taternuts April 1, 2007

Cumbumper 

A term for a woman who rides a dick long after the climax has been reached, when she is pounding a dick covered in cum.
"Fuckin' A that bitch rode me for 2 hours! She was a real cumbumper," said Lucius.

"Your mother is a cumbumper, I know because we bumped cum last night!" said Terrence to his eight year old son.
Cumbumper by Randy Peters December 24, 2008
someone with traces of cum in and around the bum; a faggot; a Lucas.
Lucas bends over for any black man who's willing to unzip... he's such a cumbum.
cumbum by Brookie373 March 17, 2008
Having sex for less than a minute before your partner cums.
Oh man, last night's sex with that guy was such a cumbum. I felt so awkward.
Cumbum by Jaimsternator September 3, 2009
Someone who has little motivation to better their life and will be a lifer foreverchild.
I've been one before.
Takes one to know one.
You can grow out of it, if you don't have severe brain damage.
crum bum
crum bum by PineappleJuice March 14, 2015