black sac 

an adjective meaning something cool or good.

Gabe has a black sac style that everyone around him wants.

black sac by Daniel Younan February 23, 2009

Back Sac 

The practice of pulling your testicles between your legs until they become rested on or near the anus. Performed by guys with the name of Chadd.

If you don't quit back sacking, your testicles will become streched out. \

Don't back sac me bro!

Back Sac by Peter Heineken December 1, 2007

Black Sack 

A condition caused by excessive lint (commonly present in a new pair of underwear) clinging to the scrotum after the first use. The fuzz will fuse with ball sweat or Fermunda Cheese giving the appearance of an African-American's scrotum.

Trisha was disgusted at my Black Sack! She didn't believe that it was from my new pair of Fruit-of-the-Loom boxer briefs.

Black Sack by RealTexarkanaTits August 26, 2013

[Black Sack Maniac] 

a white girl who enjoys the black dick over the white

she truely was a Black Sack Maniac

[Black Sack Maniac] by dgbush February 25, 2009

Black Sack 

A black scrotum

look at that black sack

Black Sack by JackqavisYT November 17, 2020

Sack to Back or Sac to Back 

Sack to back is the term used when two males ride a motorcycle or scooter together.
Also referred to as "Butts to Nuts"

Those guys are riding "Sack to Back or Sac to Back"

Sack to Back or Sac to Back by Indetrucks March 4, 2011

Big Black Sweaty Ball Sack 

When something is extremely hard

This AP European Test is gunna suck big black sweaty ball sack

Big Black Sweaty Ball Sack by Creelster January 11, 2010