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1. mod. alert; having a positive state of mind. Those guys were jazzed and ready for the game.
2. mod. alcohol or drug intoxicated. Dave was a bit jazzed up, but not terribly.
3. mod. enhanced; with something added; having been made more enticing. It was jazzed enough to have the police chief around asking questions.
4. mod. forged or altered. (see also tinseled.) Better not try to cash a jazzed up check at this bank.