from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One, such as a social director or entertainer, who encourages guest or audience participation.
- n. One who incites others to action.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An employee - usually male - of a Catskill Mountains resort charged with the duty of entertaining guests throughout the day by providing any number of services, from comedian to master of ceremonies.
- n. A lively, puckish man.
Yiddish tumler, from tumlen, to make a racket.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Yiddish, circa 1930, tuml(en) and -er. (Wiktionary)