Wikipedia
The Hully Gully is a type of unstructured line dance often considered to have originated in the sixties, but is also mentioned some forty years earlier as a dance common in the black juke joints in the first part of the twentieth century. In its modern form it consisted of a series of "steps" that are called out by the MC. Each step was relatively simple and easy to execute; however, the challenge was to keep up with the speed of each step.
The phrase "Hully Gully" or "Hull da Gull" comes from a folk game in which a player shakes a handful of nuts or seeds and asks his opponent "Hully Gully, how many?"
"(Baby) Hully Gully" is a song written by Fred Sledge Smith and Clifford Goldsmith and recorded by The Olympics. Released in 1959, the song peaked at number 72 on the Billboard Hot 100 in February 1960, and sparked the Hully Gully dance craze.