à go·go or à·go-go 
(ə-gōgō′)
(ə-gōgō′)adv.
In a fast and lively manner: dancing à gogo.
n. pl. à go·gos or à go-gos
A nightclub for fast, lively dancing.
[French à gogo, galore, from Old French a gogo : a, to (from Latin ad; see AD-) + gogo (probably reduplicated form of gogue, merriment).]