jitterbug (n.) Look up jitterbug at Dictionary.com
popular type of fast swing dance, 1938, American English, from "Jitter Bug," title of a song recorded by Cab Calloway in 1934. Probably the literal sense is "one who has the jitters" (see jitters; for second element see bug (n.) in the slang "person obsessed with" sense). Another sense current about this time was "swing music enthusiast." As a verb from 1938.