dilwacker Share definition Flag a douche bag; a fake; an arrogant yet stupid slob; a user/abuser of people or things; a synthetic penis; a jerk. That guy from Janesville is such a dilwacker! That's the last time I'll let him date my daughter! dilwacker by thingoneandthingtwo November 5, 2012 0 0 Get merch Get the dilwacker mug. Buy Now — $32.95 See more merch