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1. rude slang A chaotic situation rife with problems. Oh, the dinner party was a total clusterfuck—the roast was dry, the toilet overflowed, and everyone argued about politics.
2. vulgar slang A group sexual encounter. No, I've never taken part in a clusterfuck—have you?
1. n. an act of group rape. (Also Charlie Foxtrot from the initials CF. Usually objectionable.) Look at her! She’s just asking for a cluster fuck.
2. n. any event as riotous as an act of group rape. (Figurative on sense 1 The same allusion as sense 1) This goddamn day has been one long cluster fuck!