Sack Back

When one man places his sack on another man's back. Used in the penis showing game

Wacko:(standing shirtless working out)I love working out
Ed: (standing naked)I love my sack on people's backs
(jumps on Wacko's back, and his sack is on Wacko's back, thus giving him sack back)
Wacko: God damn it Ed!
Ed: Gotchya Wacko!
(Proceeds to kick Wacko in the ass twice)

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Vacuum-sacking

Inserting one's ballsack into a 'space bag' whereupon an airtight seal is achieved, essentially 'locking in' the freshness of the ballsack for others to enjoy at their later convenience.

"Dude, I was vacuum-sacking my nutsack for my girlfriend. She gets back in three months and I want to preserve all the goodness for her".

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The Fat Sack

When a male inserts his penis AND testicles into the urethra of another male, causing the receiving male to have a "fat sack".

Guy 1: Honey,I want myself in you, but I'm tired of just anal
Guy 2:Okay, let's give me the fat sack.

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lerro sack

A fat dude's chest with boobs and rolls

Check out that guy's lerro sack and cankles

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bloody spooge sack

When your spooge becomes somehow bloody, then leaks on to ur sack. It then becomes a bloody spooge sack.

EWWW Ben Affleck spooooge!!!

Whenever he beats off, he always gets a bloody spooge sack...wtf?!

back sack attack

The assault of one's testicles from behind. Generally, the victim is bent over, however a standing attack up the legs is also commonplace.

Often times, the assailant will yell "back sack attack!" either at contact, or after the strike is complete.

Winding up for a kick, Ben positioned himself behind a bent-over Matt. Using mostly the flick of his foot unto the scrotum, Ben yelled "Back sack attack!" before Matt ever got the chance to react. Devolving into his fetal position, Matt sat writhing in pain.

sacked in the back field

when a nigga nutt in ya butt

She finna get sacked in the back field, deadass timbs b