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1.
A insult used to offend somebody who goes against a dedicated cause they used to stand by. It's origin comes from the anime Code Geass when one of the antagonists is accused of treason when the main protagonist uses a bluff to cause suspicion on the antagonist.
(person1 and person2 talking about person3)

person1: He says he's a faithful lover yet he always cheats on his girlfriend!

person2: Yeah he's obviously an orange boy.
by bitchesxlovexmyxedge December 11, 2010
 
2.
A boy who is fairly orange in color.
Matt.

Kristie "hey, did you see that orange boy?"

Girl "Yea, matts over there."
by KristiexBaby August 20, 2008