When you bend over with no pants or underwear on, and from behind, it looks like your butt has a ball sack.
(this takes place in a locker room)
Man 1: "Dangit, i dropped my deodorant."
(man 1 bends over naked to pick it up)
Man 2: "What?"
(man 2 looks over to see what happened)
Man 2:"DUDE!, i can see your butt-sack!
to pull back the scrotum with a pliers until it is directly over the anus, then punching it into the anus (you might want to wear gloves); approximately equivalent to 1000 punches in the shoulder.
If Star Wars Battlefront 3 doesn't come out for PS2, I'm gonna butt sack someone.
A small pouch that is formed when someone is continually done in the asshole. Usually fills with anal secretions and all kinds of nasty shit, including old, rotten, cum.
1. Oh shit, my butt sack is full again. Hold on while I go squeeze it out.
2. What's that gay kid doing?
Itching his butt sack.
EWWWW!