badunkalunch Share definition Flag (N) Term used to describe a meal (usually eaten around mid-day) that contributes to a badunkadunk, or exceptionally large posterior. God DAMN I'm so full baby boo. That big mac combo was a baDUNKALUNCH fasho tho. badunkalunch by PedaPhil March 10, 2008 0 0 Get merch Get the badunkalunch mug. Buy Now — $32.95 See more merch