a male entertainer, as formerly employed by resorts in the Catskill Mountains, who combined the duties of a comedian, activities director, and master of ceremonies to keep the guests amused throughout the day.
2.
any lively, prankish, or mischievous man.
Origin: 1930–35; < Yiddish tumler one who makes a racket, stir, equiv. to tuml(en) to make a racket + -er-er1; cf. MHG getümel noise; see tumble