A fork of Rural Dictionary
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"
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"
A woman who is a cum dumpster but dumber.
Tara is one stupid dumb cumster.