Top Definition
A fraternity centered around the consumption of the popular brand of beer "Natural Light". First chartered in the year of our lord 1999 by the original Naternity Brothers (Nat Bros for short) of Jacksonville State University. Chapters have sprouted up in several other nationally recognized colleges and universities in the past decade, and the fraternity is working towards being and officially recognized nationwide fraternity.
by JSU Nat Bro January 29, 2010

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