When a woman tightens the muscles towards the opening of her vagina to "lock" the man's penis in place.
"She totally pulled the fucklock on me."
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Sexual position in which a British girl wraps her legs around her sexual partner tightly while bracing for a second male mate's attempt to blast her in the ass.
"Leanne had that dude in the british fucklock, must've been anticipating a third party!"
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