FIIDIMS Share definition Flag An abbreviated form of "FUCK IT I'LL DO IT MYSELF". Often screamed or used when frustrated at the lack of effort displayed by others when there is a task or project to be completed. Joe and John were given the project, but Steve screamed FIIDIMS, so I guess he's going to do it FIIDIMS by L2Guy September 16, 2010 0 0 Get merch Get the FIIDIMS mug. Buy Now — $32.95 See more merch
