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Home to the baddest motherfuckers in the Greek system. Brothers share a bond for life and will kick your ass if you try to fuck with it. Also some of the smartest and most fun people to hang out with. Girls love 'em, guys wanna be 'em.
Guy 1: Dude, were you at the Theta Xi party last night?
Guy 2: Yeah man, JJ got drunk and fought two midgets. It was fuckin' sweet.
by KOdont3fuck0around9 May 16, 2007
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Fraternity that the rejects of college join. Fat nerds join this frat so they can wear the t-shirt. Membership is open to anyone and everyone, because they have NO standards. Getting drunk and playing X-Box is how they roll.

Also known as "Date-a-guy"
Nerd guy 1: "Hooray! I'm in a frat! I'm cool now!"

Nerd guy 2: " Your XO shirt is cute. Do me. In the butt."

Professor: "Hmmm, Theta Xi has created another homo. Curse them!!!"
by jvarna5 January 28, 2008
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