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The act of a man putting the top of his penis on a girls vagina during sex, but rather than going in it, rub it up and down, with his penis between the tops of the girls thighs. Very useful when intercourse is not desired for one reason or another. Condoms are unnecessary, but optional.
"hey, were you having sex with that girl last night?"

"no i wish, we were just Slidefucking."
by balltoohard10 December 22, 2011