The Frug (English pronunciation: /frʌɡ/ or "froog") was a dance craze from the mid-1960s, which included vigorous dance to pop music. It evolved from another dance of the era, the Chicken. The Chicken, which featured lateral body movements, was used primarily as a change of pace step while doing the Twist. As young dancers grew more tired they would do less work, moving only their hips while standing in place. They then started making up arm movements for the dance, which prompted the birth of the Swim, the Monkey, the Dog, the Watusi, the Mashed Potato, and the Jerk. The Frug is sometimes referred to as the Surf, Big Bea, and the Thunderbird.
A perfect example of a Frug is found in the movie Sweet Charity (1969), which contains a number called "The Rich Man's Frug", a wildly energetic dance number comprising three "movements" ("The Aloof", "The Heavyweight" and "The Big Finish") that showcases director Bob Fosse's distinctive choreography style, particularly his creative use of unusual poses, gestures, and arm movements. The evolution of Frug also signified maturation of theatricality in Fosse's choreography, departing regimentation towards visual dissonance, where every dancer could perform their own moves.
The Frug is mentioned prominently in Allan Sherman's 1965 song "Crazy Downtown," a parody of Petula Clark's "Downtown".
The B-52's 1978 song of 1960s beach party film references, "Rock Lobster", contains the line, "Everybody's rockin'; Everybody's fruggin' ".