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Sexual slang (U.K, East Midlands, South Yorkshire, Lancashire (localised) :When men brag to their mates about sex with a very attractive women. EG: "I can't believe I knacked her"? Anecdotally lying or exaggerating popping a girls cherry. E.G: "I knacked her ya know?" Or similarly gloating about "breaking in" or "destroying" a supposed virgin (slang for wild, kinky, hard or just passionate sex) a woman known to be classy, and/or hard-to-get (usually to other lads). Or anal sex with a women : "I PROPER knacked her!" Conventionally among friends being deliberately as innapropriate, forthcoming or sexist, common as possible by replacing: "Knacked her." With: "knacked that"
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