Top Definition
Very infrequently occuring semi-natural disaster in which a tornado descends upon an active volcano and hurls the lava about (lavabomb) in a haphazardly manner, thereby exacerbating the situation.
Did you see that tornado that hit Mt. St. Helens while it was erupting? It was definitely a M3 torcano on the Marsh scale.
av Tha Wizz 10 juni 2009

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