1. An obnoxious word shouted by those who enjoy drawing attention to themselves. Usually followed by an profanity such as "mofucker" or "bitch"
2. Meeyah usually relates to the most obvious answer to a question, rather than something either off topic or tasteless.
Q. "Would you like me to get you some more of that alcoholic beverage of which you are currently undergoing consumption?"
A. "Meeyah mofucker!"
Q. "Would you like this money I obtained 100% legally?"
A. "Meeyah!" meaning "yes"