tfu;dr Share definition Flag To Fucked Up; Didn't read. Commonly used forum acronym often used in response to a long fucked up post that is not worth reading. You: <long fucked up post not worth reading> Me: tfu;dr tfu;dr by Tur_ January 17, 2009 0 0 Get merch Get the tfu;dr mug. Buy Now — $32.95 See more merch