fuck off then Share definition Flag ''Fuck off then'' most often it's used like a response and it means ''Go and don't waste my time'' or ''leave me alone'' etc. -Hey Johnny you want some icecream? -No! -Well,fuck off then! fuck off then by Gunaholic AF May 16, 2016 0 0 Get merch Get the fuck off then mug. Buy Now — $32.95 See more merch