When A guy shoots his load into a chicks arse - aka 'C in the B'
"Would you like some Cum in the Bum?"
by Robert J. Melrose May 19, 2003
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The act of taking a jizz on a woman's ass while she's still wearing her pants. The result of the man's unwillingness to wait for sex with his old lady creates a white stain on the woman's pants that is extremely difficult to get rid of.
Jerk #1 - "Yo brotha, there's a white stain on the back of your girlfriend's pants."

Jerk #2 - "I know. Last night I was so anxious to have sex with her, but I ended up giving her a cum bum instead."

Jerk #1 - "Word."
by Elmer April 10, 2005
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a person that likes to take it up the bum
Ashley is a cum bum.
by bumbumbum69 November 12, 2010
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when you got semen between ur butt cheeks.
"me and sally were doin the doggy. and then i skeeted on her" says jose.

" oh no way dude you gave her a cum bum!" - javier

"yeah i did!" - jose

by jay doshi1 February 8, 2009
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A cum bum is simply a cum bum. Cumming in Bumming is also another way to say it.
" you're such a cum bum"
"Fuck you Cunt"
by Bailey Brown lover March 24, 2019
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