A cum dumpster will often allow men to literally shower her with semen.
Boy 1: My room is so dirty cuz all the fappin i have been doin lately. My pillow and webkinz are like a cum dumpster now.
Boy 2: Thats fucked up.
Boy 1: Dude, that girl slept with 5 guys last night.
Boy 2: Woah! She is a cum dumpster!
Boy 1: She sucks dick every night bro.
Boy 2: She got a cum dumpster for a mouth.
a girl who has been injected with a LOT of semen.
either orally, analy, or vaginally.
person 2: what's a sarah?
person 1: y'know, a cum dumpster
person 2: oh yeah. sarah is a huge cum dumpster