whup the bunny Share definition Flag To whup the bunny is to really, truly, monumentally screw up. To screw the pooch. I had everything worked out just fine for the party, and then Marjorie just had to come along and whup the bunny for everyone. whup the bunny by Fearman March 4, 2008 0 0 Get merch Get the whup the bunny mug. Buy Now — $32.95 See more merch