On hot days your ass and nuts start sweating, and some of your butt sauce begins migrating to your nutsack across your taint, causing irritation and general discomfort

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.

a man with mustard on his nuts

when a man sticks his scrotum inside of a womans vagina and has her urinate on his balls while he ejaculates

When your cum is thick and yellow like mustard.