Complete giberish. Means everything, and nothing. The phrase means what ever you want it to mean, though it was originaly heard in the game Half Life 2
Rick: What should we do?
Mark: Yabba My Icing??
Tom: Dude, I broke your cell phone.
Craig: Yabba My Icing bitch!
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A person, male or female, who cheats at videogames, and then deny's it. Cheating counts as screen-peeking, killing while another is in the bathroom, or quitting the game because their death is eminent.
BJ, stop screen peeking you mesta douche!
Stop team killing you mesta douche.
BJ, you such a mesta douche! You killed me when I was in the bathroom!
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