Top Definition
Smugtonium is a potentially explosive material that is present when one person regularly has an obscenely smug smile, inciting the other person to explode in violence.
That smug bastard had that smug little smile of his- it was like smugtonium to me and I couldn't help but explode and hammer that f*cker!
by Timmybung December 17, 2009
5 Words related to Smugtonium

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