1. An individual, usually female, whom is considered and utilized for ejaculating in. Men have been known to get filled with cum as well, take Mephistopheles Foetusgrubber for instance...he is a cumdumpster and an advocate for cocks and cumloads...
2. A sperm bank comprised of a lucky individual.
3. A bimbo, a trollop, a slut, Me in a "nutshell."
4. Lastly, cumdumpster can be defined by many Bukkake actresses.
Oh my god, I cant believe I just got cream piegangbanged by like-50 guys; wow what a cumdumpster I have become!!!
(n.) - a uncomplimentary term used to describe a person, most notably a female, who is a slut *and* will likely amount to nothingin life.
(example 1)
John: Did you hear about Chris's new girlfriend?
David: 'Nah, what's she like?
John: She's a high-school dropout, and she's loose as hell.
David: Damn, she sound like a cumdumpsta-nothin!
(example 2)
John: So how's it goin' with the new gf?
Chris: Man, I dropped that ho -- she ain't nothin' but a cumdumpsta-nothin!