When a woman, usually desperate for a baby, takes a used condom out of a trash can and uses its contents to inseminate herself. (read: When one man's trash becomes a woman's treasure.)
1. My man caught me poking a hole in the condom the other night and is withholding sex from me for a while. Once I gain his trust back, I'm giving cumster diving a shot.

2. -Whoa, you have a baby? When did that happen?

- About 9 months after a night of cumster diving.
by levatuldo December 7, 2009
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A homie who lets his bros blow a load in his ass after a breakup or when they're feeling a little extra horny. A cumster dumpster can be gay but is most often just a really sweet straight guy
" Yeah ,after me and Michelle broke up two weeks ago, Jimmie has been my cumster dumpster"
by big tiddy goth boyfriend November 12, 2020
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The inverse of a cum dumpster, a dumb cumster is a person who is down bad and willing to have sexual relations with literally anyone, regardless of an indiviual's manner, characteristics, personality or personal hygiene.
"Matthew is one horny motherfucker, he's such a dumb cumster"
by g.dubbs April 20, 2022
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A female slut that takes lots of guys jizz in her vag in a short period of time.
"Dude she is a total cumster dumpster. She slept with 5 dudes last night and none of them wore rubbers."
by greenthirstyturtle March 21, 2013
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A clever way of switching the beginings of the two words Cum Dumpster.

Meaning a stupid slut
"You're Mom's a Cum Dumpster!"

"Well, you're a Dumb Cumster"
by Kleinsauced Her February 28, 2007
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Used in accordance of a close friend being an asshole, to the degree that you'd call them a cum dumpster.
by Rs1nfinite July 5, 2021
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Jerry: Hey John, why do you cum a lot?
John: I am a cumster
by 1 Dead Pixel November 23, 2020
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