TTFL Share definition Flag An abbreviation for thank the fucking lord.This is used as a sign of relief or happiness towards something. P1: is the test cancelled tomorrow? P2: yeah, it is. P1: TTFL or thank the fucking lord TTFL by tsabranD December 8, 2010 0 0 Get merch Get the TTFL mug. Buy Now β $32.95 See more merch