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1 definition by AnthonyGG

A person who puts an end to a funny joke, or line of jokes.

When someone tries to be funny but instead stops everyone else from laughing.
Elmo(Hypebeast) from excentrixgamingis a joke killer.

We are on Ventrilo telling jokes and laughing at stupid shit and elmo will come out of nowhere and kill the joke.

Elmo gets paid $2.15 an hour to kill jokes.

Albeezy "Id have to be hella high to laugh at one of Elmo's jokes, stupid nigga kills everything."
by AnthonyGG October 06, 2006