1. An early version of the term "bebop," i.e., a modern jazz style popularized by Dizzy Gillespie, Charlie Parker, and others. The term continued to be popular in England into the 1970s, and is sometimes combined with "bebop" to produce scat-sounding jive talk--e.g. "Bepob with the Rebop."

2. Cab Calloway uses it generally for joyous, intoxicating music, with a hint (as so often in Cab's hep talk) of drugs (see example).

When you eat dirt for the first time and leave your family to build a shack in the woods