an abbreviation of the phrase "what do you have?" or "what you got?" most often used in conjuction with "chall do" or "what it do"
Mike: Chall gat homie?
Bellend: Oh son Ize just ripped off Little Ricky. I gat 21 oz. of blow and one clean ass desert ease.
Mike: Chall gat no prints on that ish?
Bellend: Nah son.