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 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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