jazzed upEnglishOxford New American Dictionaryjazzed up ▸ adjective having been made more interesting, lively, or exciting: a jazzed-up version of ‘Jingle Bells’. ▪ (also jazzed) North American informal 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.