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1.
Short for, "Mythbusters that shit!"

Telling somebody to check the TV show Mythbusters as a rebuttal after they wrongly claim a myth/rumor is true.

Especially helpful if they still disagree with you after your first refute.
John: A penny dropped from the Empire State Building can kill somebody.
Brian: No it can't...
John: Dude, I read it online.
Brian:Dude, MYTHBUST THAT SHIT!!!!!!
by Marshmallowcrew October 11, 2010