hep
adjective
Origin
US slang of unknown or disputed origin, first recorded 1903. Robert Gold suggested that it is a variant of hip, from white jazz fans’ mishearing African American musicians. Jonathon Green suggests a connection to a 19th century interjection used to drive horses; compare gee up.
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.