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3.
any egregious acts such as trashing or vomiting in someone's house or in a public location that may ruin the night, the place or the persons life. (in some cases may incur one fines or lawsuits)
1:man chris puked all over and tore up my couch last night
2:yea man, he really pi-phi'd your house

1:you hear about those girls that pi-phi'd homecoming?
2:yea, they were a real class act.
by J.J. Cales May 28, 2010
 
1.
1. Defined as the group of womes composed of the hottest girls you can find on a college campus.

2. Party chicks who get all the guys making the other greek chicks jealous, and single
Did you see those new pi phi pledges? They're fucking hot, just like the other pi phis!
by Spring of 05' January 11, 2005
 
2.
A nickname commonly used to refer to the organization knowns as Pi Beta Phi, or its members. Pi Beta Phi is Fraternity for Women whose mission is to promote friendship, develop women of intellect and integrity, cultivate leadership potential and enrich the lives of members and their communities.
When you meet a Pi Phi, you realize immediately that there's something unique about her.
by PanhellenicPrincess April 04, 2004
 
4.
This is the greek phrase for bitch club.
All these Pi Phi's be makin my penis soft.
by Chirp Chirp December 11, 2004