mud bunny Share definition Flag When anal sex occurs and the fuckee has not cleaned their anal cavity properly (i.e. a euphemism for shit). Dude! Why didn't you get all that mud bunny out of your ass before you let me put my dick in?! mud bunny by folkyboy September 26, 2008 0 0 Get merch Get the mud bunny mug. Buy Now — $32.95 See more merch