G'wan, b'y
A swear-filled way of saying 'go on, boy' that people from the East Coast use when they're too angry or too dumb to say anything else.
G'wan, b'y! You actually think you're the best at everything?
G'wan, b'y! You just got yelled at by your boss again?
G'wan, b'y! You tried to text your mom and it came out wrong?