"What Up, What's Haapnin'" is a song by American rapper T.I., released on September 2, 2008, as the fifth single from his sixth studio album Paper Trail (2008).

The song, which was produced by high-profile American record producer Drumma Boy, is a diss track directed towards fellow Atlanta-based rapper Shawty Lo, in response to his multiple accusations that T.I.

The video, directed by Kai Crawford, was filmed in Shawty Lo’s neighborhood.

and others can be seen mocking Lo by doing the dance that accompanied his single "Dey Know".

[3] The video includes cameo appearances from Lil Duval, Rocko and Future, as well as a relatively unknown Meek Mill, who at the time had just signed to T.I.‘s Grand Hustle label.