TFI Share definition Flag What one exclaims upon seeing a girl with voluptuous melons. It stands for Titty Fuck Immediately. "TFI! TFI!" Rick screamed as he saw Kathy walk into the party. TFI by Aryan the Slut August 5, 2008 0 0 Get merch Get the TFI mug. Buy Now — $32.95 See more merch