"What's Happenin'" is a song by American rapper Juvenile and the second single from his seventh studio album Reality Check (2006). It was produced by Sinista.
"What's Happenin'" is a party and street-themed song. It finds Juvenile performing in a flow similar to that of "Posse on Broadway" by Sir Mix-a-Lot.
Steve "Flash" Juon of RapReviews wrote "Juvenile is ready to scrap, and even though he's consistantly [sic] underrated as a lyricist he constantly comes through on tracks like 'What's Happenin'<nowiki/>'. J. Freedom du Lac of Houston Chronicle called the song a "fantastic hard-core homage" to "Posse on Broadway".
The music video was directed by Ben Mor and shot in Juvenile's hometown of New Orleans, in the Lower Ninth Ward. It was filmed as the second half of a video for both his song "Get Ya Hustle On" and "What's Happenin'".