Fonzinoon Share definition Flag Someone who farts in the bathtub and pops the bubbles with their teeth. My girlfriend took a bath the other day and I walked in on her just as she was doing a fonzinoon. Fonzinoon by Dan "the man" W. July 16, 2008 0 0 Get merch Get the Fonzinoon mug. Buy Now — $32.95 See more merch