grinding
n.— «But by wiling out—an urban slang term used to describe going wild on the dance floor—Tabaziba sticks out in the packed club. Most of those around her are flirting at the bar, standing, two-stepping, or couple “grinding.”» —“Boston can’t put a krump in its style” by Malena Amusa Boston Globe Aug. 1, 2005. (source: Double-Tongued Dictionary)