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
A social class of guido's and child molestation victims banded together, most frequently characterized by their spikey hair, sun tanned bodies, and acid washed jeans. They are the ultimate in cool and are known to give the best blow jobs and rim jobs out of any other Fraternity.
1) A Collection of Dildos

2) Christian
by jimminy cricket March 28, 2005

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