sack dance n. (originally) in American football, a showy celebratory dance performed after the take-down of a ball-carrying quarterback; (hence) especially in competitive events, demonstrative movements or gestures by a person in a (self-perceived) advantageous position. Editorial Note: The sack dance takes many forms, including jigs, whirling, capering, leaping, strutting, prancing, air-pumping, hip-thrusting, or the miming of sexual acts. In the early 1980s New York Jets defensive end Mark Gastineau became well-known for his sack dances, which were banned by the National Football League in 1984 but continued in other sports and contexts. (source: Double-Tongued Dictionary)
Further reading
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