Dumpster Biscuit Share definition Flag A used condom behind or near a dumpster. "Ew, a dumpster biscuit, what kind of a gross derelict would **** something behind a dumpster." Dumpster Biscuit by SlothWASMachete July 15, 2010 0 0 Get merch Get the Dumpster Biscuit mug. Buy Now — $32.95 See more merch