To run fast.
The cops showed up so I had to shag ass.
v. to flee from an area, typically to evade trouble
Guy 1: "Yo man, you got the goods?"
Guy 2: Hell yeah, give me just on sec my man."
Guy 1: "Oh shit! It's the fuzz! Lets shag ass!"
Guy 1: "Dayyyummm! Look at that fine bitch comin'this way."
Guy 2: Nigga, dats my ex! The one I was tellin' you bout who won't stop callin' my house. Lets shag ass!"
A girl who openly flirts with men and has a very active sexual life.
Dude 1 : Yo, I have a girlfriend
Dude 2 : Who is she?
Dude 1 : Ciara
Dude 2 : Yo man, I heard that girl is a real shag' ass
to walk very slowly so that your ass jiggles with every step
Fred and Sally like to shagass when they are shopping
the act of shag
ing someone's ass
If you shag ass her, then shed be waddling for days.