ess tee eff you Share definition Flag The written out pronunciation of the acronym "STFU", which stands for "Shut the fuck up". wE dun likes what u says SO ess tee eff you hoe ess tee eff you by bklethal April 22, 2009 0 0 Get merch Get the ess tee eff you mug. Buy Now — $32.95 See more merch