Top Definition
A large social fraternity founded on February 26th at Vincennes University. Today, with chapters all over the U.S. and Canada, over 88,000 Sig Pi's, and it's headquarters in Brentwood Tennessee, it is a great fraternity, with brotherhoods lasting long after one receives their diploma.

Far better than SAE or TKE, they have no rivals.

Sigma Pi or die!

I Believe.
Man, those Sigma Pi's at Loyola University Chicago are the shit! They throw the best parties, have the best gpa's, and just basically have their shit together. They don't suck dick or date rape girls like those other frats.

by Sigma Pi February 07, 2008
Sigma Pi, the boys in this fraternity are only in it to associate with Greek Life, they are in no way better than or try to be better than the typical tool on campuses. Chapters consist of all the boys rejected from other fraternities and for that reason, they rely on tool shed workshops to make themselves seem like they are more than they actually are. They are better than SAE and TKE however, they do happen to look at a rush before saying "We Like Dick!"
"We're all failures; Join us at Sigma Pi!"
by Rumpled Stillskinny May 10, 2009
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