Dead Bunny Share definition Flag (Adj.) A horrible letdown. A total buzzkill. Like getting a bunny for Christmas, then 2 days later it dies. How was your day today? It was a total Dead Bunny day.This beef stew is dead bunny. Dead Bunny by ScraP Dr7 December 28, 2009 0 0 Get merch Get the Dead Bunny mug. Buy Now — $32.95 See more merch