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The act of cannabis consuming itself in some way.
No.1: "Dude, I think my weed ate itself..."

No.2: "No, not cannabisism, are you sure you didn't smoke it?"

No.1: "Oh yeah, I did."
by RalphHoward November 19, 2013
One who one eats foods containing cannabis (ex: pot brownies, pot cookies etc.)
Did you hear the Stoner party was found guilty of cannabisism?
by yessir5543 May 30, 2009