Top Definition
Asian American Interest Social Sorority and one of the most well known asian sorority in California.

Has the downest girls and are always rivaled with alpha kappa delta phi.
Girl 1: Hey are you going to rush kdphi or sopi?

Girl 2: Sigma omicron pi of course
by knowwassup December 22, 2013
A West Coast Asian interest sorority. Also commonly referred to as, "S-O-Pis". Many of the campuses that sport chapters of SOPi also have a chapter of KDPhi, Alpha Kappa Delta Phi.
"KDPhi, spread your thighs.
SOPis, look like guys." (Sigma Omicron Pi)
by Gordon Lee September 04, 2007
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