wacker plunk Share definition Flag The act of masturbating to internet porn while taking a shit on the toilet. Jebidiah enjoined a long wacker plunk after a night of eating bean tacos at one of the many trashy Portland, OR strip clubs. wacker plunk by JAJman69 January 23, 2010 0 0 Get merch Get the wacker plunk mug. Buy Now — $32.95 See more merch