Fuck up Share definition Flag Australian slang meaning "shut the fuck up" mostly used with the word "cunt" to make "fuck up cunt"mainly used by bogans and crackheads "your Mum is a fucking slut you disabled fuck!""fuck up cunt!" Fuck up by Sodanic April 23, 2019 0 0 Get merch Get the Fuck up mug. Buy Now — $32.95 See more merch