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Basicly any sexual act. Normally used when the sexual act isn't clear.
I heard him and Kate slapping the nasty last night

Damn, you're sweaty, have you been slapping the nasty?

He likes to slap the nasty with cherry-flavored lubricant.
by Baby Gloomi April 06, 2006

Words related to slap the nasty

jack off masturbate nasty sex slap