firf Share definition Flag to fart silently, usually in a public place where you fear others may hear your flatulence. Matt: So I was at this party, and I really had to fart, but I just went for a firf so no one would hear me. Lucy: Nice move. firf by lulubalooza September 18, 2009 0 0 Get merch Get the firf mug. Buy Now — $32.95 See more merch
