dumcumpster Share definition Flag A man who only has sex with cumdumpsters, usually out of necessity rather than prefernce. Benny is a real dumcumpster who wouldn't get laid if it weren't for the drunken pursuit of buddies' discarded bobags. dumcumpster by Russell Clark May 14, 2006 0 0 Get merch Get the dumcumpster mug. Buy Now — $32.95 See more merch