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2.
So good you'll die!
little boy: "Watch my poisonous pillow-jump!"
me: "Poisonous? What does that mean?"
little boy: "So good you'll die!"
by Agent Crush August 19, 2008
 
1.
bad, unpleasant, boring, a term to express an overall disappointment
That party we went to last night was poisonous.
by Rocky February 10, 2004