noun

• (music) A musical art form rooted in West African cultural and musical expression and in the African American blues tradition, with diverse influences over time, commonly characterized by blue notes, syncopation, swing, call and response, polyrhythms and improvisation.
  "You dare to bring your jazz songs into my house!"
• (figurative) Energy, excitement, excitability.
  "“You want something zippy there. Something with a bit of jazz to it!”"
• (with positive terms) Something of excellent quality, the genuine article.
  "That show was the jazz!"
• (slang) Semen, jizz.
  "Suddenly, Bobby oozed his jazz into Gene's throat."

verb

• (slang) To destroy; to ruin.
  "You’ve gone and jazzed it now!"
• (slang) To complicate.
  "Don’t jazz it too much!"
• (intransitive, US slang, dated) To have sex for money, to prostitute oneself.
  "‘Jazzing?’ Temple whispered […]. ‘Yes, putty-face!’ the woman said. ‘How do you suppose I paid that lawyer?’"
• (intransitive, slang) To move (around/about) in a lively or frivolous manner; to fool around.
  ""In the old days, heaps of unmarried women were companions, and let me tell you, my dear girl, they had a much better time than they have now, with all this jazzing and short skirts and pretending to have careers. The modern girl hasn't a scrap of decent feeling or sentiment about her. Money--money and notoriety, that's all she's after. That's what we fought the war for--and that's what we've come back to!" "George, do keep to the point. Miss Dorland doesn't jazz--""