throwing sack

To throw a party that is an absolute rager. Abbreviated from “Throwing Nutsack”, generally just meaning you are throwing a good party. Alternatively the term can be used ironically to describe a really shitty party. Typically used in college and frat cultures

Frat guy 1: “Yo did you go to Mikes last night? Heard he was throwing sack”
Frat guy 2: “Yeah man it was a rager, absolute sack”