when you having sex and your balls are slapping against the girls ass or leg
i was fucking this girl from behind and i was sack slapping her ass
by sack slapping July 18, 2014
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When a male person rubs their hand across their nut sack and slaps someone in the face with it.
Mike: I heard Raul took your juice box.

Taiquan: If he did, he's gonna get a sack slap to the face.

Mike: That shit sucks.
by Mr. Taco Killer December 17, 2009
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1) The act of rubbbing the sweat off of your own testicals and proceeding to smack the nearest individual in the face

2) when one man randomly decides to smack a mans ballsack in the middle of Lunch
'Slap'
TIM- Ahh what was that for, man?
HENRY- Dude, You just got sack slapped!
by Ballsack Stalin August 8, 2009
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When a girl is giving you head and your nut sack slaps her chin, nose or cheek (depending on position), usually after a most-aggressive head bobbing.
Mary gave me a bj last night and she went down so hard she got a sack slap from me also.
by Walleye May 25, 2007
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Two guys penetrating one girls vagina and ass at the same time and their balls slap against each other
Hey Ernie..want to slap sacks with dorthory?
by ling69 November 10, 2013
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Two guys penetrating one girls vagina and ass at the same time and their balls slap against each other
Hey Ernie..want to slap sacks with dorthory?
by ling69 November 10, 2013
Get the slap sacks mug.