boom-daddy Share definition Flag A word describing someone or something that is awesome, epic, or great; usually fallows the adjective, "pretty." Johnny Cash doing a back flip off of a unicycle while on fire would be pretty boom-daddy. boom-daddy by Dr. Aromus Tessola. August 21, 2010 0 0 Get merch Get the boom-daddy mug. Buy Now — $32.95 See more merch