Top Definition
The most badass motherfuckers around. When someone even whispers the word xi, bitches squirt in their pants. No one can even compare to the Xi's, even Lambda class. We be swaggin' all fuckin day.
Girl 1: Did you see those sexy ass guys from Xi class?

Girl 2: OH MY GOD yes! i just want to caress their dicks with my mouth.
by XI TILL WE DIE November 14, 2012

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