Top Definition
This term was coined by the gentlemen of the Georgia Eta chapter of Sigma Alpha Epsilon at Oglethorpe University, and is used to describe what is commonly referred to as a "fraternity house". The frat castle is the mother hub of social activities on campus.
Fratter #1: "Guys, where should we party tonight?"
Fratter #2: "The frat castle!"

All Fratters: TO THE FRAT CASTLE!!
by HateKillstead May 07, 2009

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