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1.
Originally popularised by libyan bandits before they assasinated infidels, now used by an elite few in CS:S as an exclamation of joy.

The length of the scream is not important, as it can vary from a simple "AYAYAYAY" to several pages of A2 paper.
"I just got a headshot! AYAYAYAYAYAYAYAYAY"
by Alistair_123 October 01, 2005