Top Definition
Pronounced: Ethel Methyl Bad Shit

A chemical or gas that the effect or name of it is unsure but you know that it is bad.

Also See Ethelmethyldieforsurenall
Bob: Hey Steve, what is it in that bottle it sure looks dangerous.

Steve: I don't know, probably ethelmethylbadshit.
by Alistair MacIlherron September 23, 2009
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