It's when you're getting completely fisted (by a colleague, your boss, the man, etc) with the added value of them opening their hand completely and giving it a shimmy shake.

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.

Fake enthusiasm (sarcasm)

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.

When a persons hands shake uncontrolably from alcohol withdrawl.

Ejaculating into your hand after realizing you have no toilet paper.

jazz hands are when you do not shave your pubic hair and it comes out of the sides of your panties #peakockthongs