What is Slip Her The Gimmick?
1.
Euphemism for sex. Gimmick is a catch-all word that ultimately became a nickname for penis, hence slipping someone the gimmick would be slipping a girl your penis.
"I heard Dave and Abi went out and he is going to slip her the gimmick."
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A reference to the movie "Fatal Attraction" when the mistress boiled the family pet to get back at the husband for the rejecti..