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1.
One who "breaks" or kills jokes.

One who takes all of the fun out a good joke.
Charles: HAHAHA that was a good joke John
Paul: OMG BE QUIET GUYS, WE'RE IN A LIBRARY......IM A JOKESBREAKER.
by Wrecklesguy June 02, 2009

Words related to jokesbreaker

annoyance disturbance ice breaker jksbreaker moment killer