Abbreviation for Phi Sigma Pi. Phi Sigma Pi is commonly known as the national honorary co-ed fraternity.
Billy - "I'm proud to be a brother of Phi Sigma Pi."
Jack - "Me too, Billy. Hey we should have a Guys Day Out event for all of the guys in PSP."
Billy - "By PSP, you mean Phi Sigma Pi?"
Jack - "Yeppers."
Billy - "Oh."
Jack - "Me too, Billy. Hey we should have a Guys Day Out event for all of the guys in PSP."
Billy - "By PSP, you mean Phi Sigma Pi?"
Jack - "Yeppers."
Billy - "Oh."
by ImBack88 May 06, 2009