Jazz is an expression of thought and feeling. It can be slow and melancholy, or quick and light. It's simply what the musicians feel at the time. It's mainly instrumental, but sometimes there can be singing. I've read some of the definitions, apparently some dislike the lack of word. Well some things can't be expressed in words.
Money Mike: "Sup baby you lookin to JAZZ tonight?"
Stupid Dunk Bitch: "Haha! You are soooo funny! OMG!!! I just smoked the wrong end of a cigarette!"
Money Mike: "Oh man I just wanna grab dem big u'll butt cheeks and JAZZ witch ya all night...just dont fart bitch."
2) Farts are Jazz to assholes.
3) I'm all jazzed about the new season of 7th Heaven.
4) I divorced the bitch because she nagged me constantly, screwed my friends, snorted my coke, smoked my weed and all that jazz.