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"