Top Definition
Wii butt is the phenomenon that occurs when a grossly out of shape person plays games such as wii bowling and the next day has a sore left butt cheek from the "bowling motion."
"Man, I was playing wii bowling last night and my arse is killing me today!"

"Yeah, you have a bad case of wii butt!"
by Miker94 January 03, 2010

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