When you are double penetrating a girl doggie style, you are slappin' sacks with the other gentleman involved.

Howard and I were slappin' sacks the other night and that bitch pulled out shot his wad on my nuts.
by whitey63 November 28, 2006
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Having good, rowdy sex. Refers to the sound made by bootymeat slapping on your lap.
"I had to kill dat bitch cause she was slappin' skins wit all da homies."

"Man, me and dis ho was slappin' skins all mothafuckin' night!"
by Johnny Insane July 7, 2008
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A drinking game in which you slap a cheap bag of wine (conveniently found inside a box of wine) and than take a big gulp from it. Known to create treasured memories you don't remember and pounding hangovers.
Duude, I was slappin' the bag way too many times last night, my head is killing me!
by goutalout December 8, 2010
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Slappin' the Grimlock is the coolest new activity you can do. Any hip new "thing" can be referred to in casual conversation as Slappin' the Grimlock, in order to confuse other people- the point being that if you have to ask what the other person means, you'll never be cool enough to partake in the activity.
"Hey man, me and my buddes are gonna go slap the Grimlock for a while, you wanna come?"

"The hell are you talking about?"

"Never mind... I guess you're just not cool enough to enjoy a good session of slappin' the Grimlock."
by Darc Discordia April 16, 2009
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