adjective

1. of dancing to rock music, as in discothèques
2. of a dancer, often semi-nude, performing erotic movements to rock music, as in a bar
3. Business, Finance, Informal
   1. of or characterized by dramatic appreciation or expansion the go-go years for U.S. automakers
   2. of or characterized by aggressive, often highly speculative, buying and selling go-go mutual funds, a go-go stock market

Etymology: short for à gogo < Fr, in plenty, ad lib., in clover < à, to + gogo, abundance, jocular redupl. of gogue, joy, prob. of echoic orig.