bottom of the jazz, to you

You may have been taken in by Daniel Cassidy's discovery of Irish roots for just about every English word, in particular:

Jazz: from teas, meaning heat, warmth, passion, enthusiasm. The common adjective associated with jazz is “hot”. Cassidy attributes its emergence in New Orleans to Irish immmigrants.

However, you should not believe anything Cassidy says.

[via Nate Dorward]