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Somebody who eats mustard with a variety of different foodstuffs. Usually in a snickering or eerily way.
Hey Jeff got some pretzels!

Jeff can we grab some?

Forget it Dave, he brought the mustard too.

Jeff can we have some pretzels please?

Stop it Dave, let Jeff be the mustard goblin that he is.
by Sports kid October 30, 2011
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