"You Know What It Is" is a song by American hip hop recording artist T.I., released July 10, 2007, as the second single from his fifth studio album T.I. vs. T.I.P. (2007). The song is featured on the "T.I.P." section of the album, which is T.I.'s more gangsta and ghetto alter ego. The song was produced by Jerry "Wonda" Duplessis and Wyclef Jean, the latter of whom contributes vocals throughout the track. It debuted at #73 on Billboard's R&B/Hip Hop Songs on June 28, 2007, later peaking at #11. It later debuted on the Billboard Hot 100 at number 68 in July, later peaking at #34.
The song was featured in the HBO series Entourage (Season 4, Episode 4), as the guys are in a club, it can be heard in the background.
The song's music video was filmed in Miami, by director and friend Chris Robinson. On June 12, the video was made available on iTunes. The video premiered MTV's TRL on June 14, 2007. There are shots of the video where T.I. appears on a plane, and on a cruise, and riding in a car (a Custom 1939 Lincoln-Zephyr Convertible Coupé) as if he were on a vacation to Wyclef's hometown. In the video version of the song, the beat is edited. The original beat features the sound of a gun being loaded and shot. In the video version, the sound of the gun being shot is edited out. The video features cameo appearances from B.G., Kymani Marley and P$C.