I think the whole phrase goes
"DOES A BEAR SHIT IN THE WOODS AND WIPE HIS ASS WITH A WHITE FLUFFY BUNNY?"

Course its a figure of speech its like the opposite of saying "yeah pigs might fly" because the don't and wont. but a bear on the other hand will shit in the woods, not sure about the fluffy bunny though. Anyway Free Your Feeling has to be my all time fav tune coz we kinda went off track here.