birdbaff Share definition Flag Slang for birdbath, used when describing a bath taken all up in the sink. Honey, we're late for the party, hurry up!Ok, I guess I'll just take a birdbaff. birdbaff by Aphik December 30, 2009 0 0 Get merch Get the birdbaff mug. Buy Now — $32.95 See more merch