fug Share definition Flag A slang word for F***. This word is less offencive and can be used in more public areas. Also it can replace words such as shit and damn in certain situations. Fug!!!!!!! That nail going through my foot really hurt. fug by Fliggs October 2, 2007 0 0 Get merch Get the fug mug. Buy Now — $32.95 See more merch