1 definition by 123Party321

Top Definition
Short for the Sigma Tau Gamma a national fraternity. Their largest chapter being the Illinois State University Chapter they are known for being one of the hardest partying frats on campus. They are also known on ISU's campus as being "Sooo Frat"
Did you hear about the sick party at the Sig Tau house friday?
by 123Party321 February 22, 2008
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