jazzed upEnglishOxford Dictionary of Englishjazzed up ▸ adjective having been made more interesting, lively, or exciting: a jazzed-up version of ‘Jingle Bells’. ▪ North American English informal (also jazzed) full of excitement or enthusiasm: there were a lot of people along the route who were really jazzed up about seeing the Air Force the kids are clearly jazzed to be performing with their heroes.