PIYF Share definition Flag abbrievation for "Pee in Your Face." A taunt used after knocking someone down onto the ground "Man, keep your ass down or I'm going to PIYF, Pee in your face." PIYF by mozziemark September 9, 2006 0 0 Get merch Get the PIYF mug. Buy Now — $32.95 See more merch
