Grinding, (also known as juking, freak dancing or freaking wining) is a type of close partner dance where two or more dancers rub or bump their bodies against each other, most often with a female dancer rubbing her buttocks against a male dancer's crotch area. The male dancer will typically place his hands on the female dancer's waist, hips, or buttocks. 
Grinding gained widespread popularity as a hip hop dance in night clubs, and eventually moved on to high school and middle school dances (especially proms) in the US and Canada where there have been cases of administrators attempting to ban it due to its explicit nature.
A predecessor to grinding as a sexually charged high-contact social dance was "The Bump", popular in the 1970s, in which the contact between partners generally involved the hips or buttocks of one dancer "bumping" those of the other dancer in temporary contact. Other predecessor elements of grinding may be attributed to the 1987 film Dirty Dancing, and the lambada, a brief dance craze of the 1980s that featured grinding actions, as seen in the films The Forbidden Dance and Lambada. A more explicit form of the dance is known as daggering.
- Gewertz, Catherine (2001-02-27). ""Freak Dancing" Craze Generates Friction, Fears". Washington Post. The Washington Post Company.
- Kennedy-Moore, Eileen (February 18, 2013). "They Call That Dancing?! Can grinding at high school dances be stopped?". Psychology Today.
- Ronen, Shelly (June 2010). "Grinding on the dance floor: Gendered Scripts and Sexualized Dancing at College Parties". Gender & Society. 24 (3): 361. doi:10.1177/0891243210369894.
- "Freaked Out: Teens' Dance Moves Split a Texas Town". Wall Street Journal. 19 November 2007.
- Black, Rosemary. "'Dance Like Grandma's Watching': High schools nationwide crack down on freak dancing, grinding" New York Daily News (February 18, 2010). Accessed: February 17, 2010.
- Ordway, Renee. "A grinding halt for Bangor High School dances?". Bangor Daily News (January 12, 2010). Accessed: July 2, 2011