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1.
adj./adv.-When something unbeliveable or unexpected happens while playing wii.
"Did you see it? Matt's head burst into flames while playing wii sports. . .man, that was pretty wiird."
by Jdizzle, Fo' Shizzle December 23, 2006
 
2.
When something awkward happens on a Nintendo Wii game.

I tried throwing a left hook, but instead it uppercutted you with my right, it was so wiird.
by Adam Lipscomb December 26, 2006