a marching band term for screwing around during practice.
Nick: Hey, quit playin' grab-ass and concentrate. Before we do this next set i want you to think to yourself: 'I'm gonna OWN this bitch!' say it with me...
A popular children's game similar to Tag. In order to "tag" someone, you MUST grab their ass. It's usually played with an equal amount of girls and boys, and for the duration of an entire day.
"What did you learn in school today honey?"
"Why, I learned how to play Grab-Ass, mother!"
*crying and sobbing*