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Definitions by thatpersonwiththeface.

When someone has one arm that is built up a lot more than another arm, most of the time their dominant arm, from playing the wii.

sort of like a trucker's tan.
After several hours of playing the wii, I now have a wii arm.

Did you see Stephens wii arm? He can lift, like, 115 lbs. with it now! But its really awkward cuz his other arm is totally useless.