"U Know What's Up" is a song by American R&B singer Donell Jones. It was written by Edward "Eddie F." Ferrell, Darren Lighty, Clifton Lighty, Balewa Muhammad, Anthony Hamilton, Clifford Harris, and Veronica McKenzie for his second studio album, Where I Wanna Be (1999), while production was helmed by Ferrell and Darren Lighty for Untouchables Entertainment.