Someone who is obsessed with Japan/Japanese Culture/Anime, etc. These asshats own a Wii (hense the "Wii" in wiiaboo). They are so into the Wii that they have an orgasm everytime they play Wii sports, play, music, fit, or the ever popular "Wii jackoff" They usually try to talk in Japanese, these words are mostly from an episode of Ninja Warrior they just watched.
Person 1: Wii sucks I never comes out with any good games.
Wiiaboo: Excuse me! Did you forget about Wii Fit. It's use of Graphs and interactive play are incredible.