An instance where your nutsack is so loose you fold it into your asshole to keep it from going down your pant legs and when you shit it smacks you in the face,is very common in Asian women

(Buht-sahk)
An insult to others, often implying stupidity, craziness, forgetfulness and the lack of athleticism. Many people use it as a joke and call their friends Buttsacks when they forget something such as a homework. Buttsack can also be nice(if it is accompanied by an complement in the form of an adjective)

A buttsack is when you ballsack is dangerously close to your anal cavity, or butt, causing a mutation in between the butt and sack also known as buttsack (can be abbreviated for butsac or "bs".

A teachers favourite snack.

A Wrinkly Ass That Looks Like A Nut Sack

Basically, it's a combination of the words ballsack and butthole. It can be used in place of either words, but doesnt have the same definitions as those words. It's used as an insult, with added emphasize on butt or asshole and ballsack. It's like calling someone a ballsack and butthole at the same time.(NOTE- symonms for butthole and ballsack can also be emphasized or used) ex.- ass-sack. Another way it's used is as a curse, like damn.

The combination of the nutsack, taint and butthole. Can be hit when kicking someone from behind.