It is created by vahe h. and originated by him being exposed to african american pop culture. the phrase has a function of greeting his friends and/or taunting someone. it is a term developing in XBOX live and soon will be used by everyone playing halo 2- the best game in the world.
By the way his gamertag is ENDER813.
ENDER813: WhAt YoUR NamE IS BoI!?