A party centered around the Nintendo Wii gaming system. A combination of the words "Wii" and "Fiesta".
Niko: Dude I totally just got Super Smash Brothers Brawl. We should totally have a Wiiesta!

Steve: Dude, you're so gay.
by Niko Jones March 12, 2008
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A party involving one or more Nintendo Wiis, and possibly mexican food.
"Dude, this weekend we should bust out the Wiisports and tacos and have ourselves a Wiiesta!"
by m0c0 June 18, 2007
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