Grinding, also known as juking, freak dancing or freaking (in the Caribbean, wining) is a type of close partner dance where two or more dancers rub or bump their bodies against each other, this is generally with a female dancer rubbing her buttocks against a male dancer's crotch area. 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.