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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."
by -MR July 03, 2008

Words related to slip her the gimmick

fuck gimick gimmick him intercourse sex sleep with slip slipping