originally the sound Link makes as he swings his sword in the Legend of Zelda; the word has now come to mean almost anything; it can be used as "hello", "goodbye", "what's up?" or even, "that shiznit is wack"
Jon: Yo what's up?
Brandon: Aya sheya!!!
Jon: AYAYAYAYAAYAYAYAYA
by Billy Bob October 03, 2004

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