A cabaret-style dance move, popularized by the musical "Fosse". Now used, usually ironically, to express excitement, glee, razzle dazzle, etc.
The move is performed by tilting the head slightly, shimmering the hands with fingers splayed either side of the face and crying "Jazz hands!" with an enthusiastic smile. Think Jack from Will and Grace.
Also *JAZZ HANDS!!!* used as an expressive punctuation on blogs and bulletin boards.
I'm all for guys getting in touch with their emotions but he's just too jazz hands for me.
The act of waving one's hands in the air in an eratic manner in response to an emotional song or situation. Similar to spirit fingers except that the entire hand and, ocaisionally, the arms, are utilized.
While listening to the Journey power ballad "Faithfully" John broke out the jazz hands.