1. An extremely aggressive greeting that has completely replaced "Hello" or "How are you" and is best used in a casual setting. For full effect, best delivered while incredibly intoxicated and delivered at full volume 2 inches from the recipient's face.

2. A statement of affirmation or approval.
1. Dude #1: *opens door into party with great force*"WHAT'S BUSTIN'?"

Dude #2: "Doing well man, thanks for asking! What's bustin' with you?"

2. Dude #1: "I just ended the year with a 4.0 GPA!"

Dude #2: "CONGRATS MAN! THAT'S WHAT'S BUSTIN'!"
by New Jeans June 15, 2018
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