clusterfuck UK /ˈklʌs.təˌfʌk/US /ˈklʌs.tɚˌfʌk/noun 2verb 1forms 3 noun2 •(slang, vulgar) A chaotic situation where everything seems to go wrong, often caused by communication failure, a complex environment, or incompetence.[Colonel Meyers:] That's for sure. What's your assessment of this exercise? [Highway:] It's a cluster fuck. — 1986 •(slang, vulgar) A sexual orgy. verb1 •(slang, vulgar) To fuck (something) up, to make a total mess of. formsclusterfucked · clusterfucking · clusterfucks