PI
Private Investigator. Also known as "Private Eye" (Not to be confused with Private Eye Magazine. Frequently hired by tabloids to do illegal phone-tapping operations and suchlike.
Damnit, some PI has been snooping on my phone lines. I bet they're from the News of the World.
by AwkOS V2*72 October 15, 2010

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Pi
A very unattractive girl, aka a 3.14 on the 1-10 scale.
Alfonso: Yo, I got dibs on that girl.
Eddie: Yea man she is pretty hot.
Derek: Man, she's a pi.
by Eddie Wyrwicz December 26, 2008

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pi
1. Circumfrence divided by diameter.
2. How losers spell pie.
1. Nerdy: How much is pi?
Nerdier: 3.1415926535897932384...
2. Jake: Pass the pi!
Jess: Loser...
by madamerouge1331 May 22, 2010

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iz tha action of a group beating up a single individual or a smaller group
gz get P.I.ed as an initiation to get into a gang
or for their birthday
la cacane a stLuc
by gunit ndg go habs go April 24, 2004

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pi
1. 3.14159265358979323846264338327590...
2. A way to tell a math joke
3. An easy way to tell people that you are either a nerd, mutant, have a humongous head, was born with a birth defect, or just fucked up.
4. Whoever typed/spelled me is really (or somewhat) lazy.
1. I can recite pi. It's 3.14159265358979323846264338327590...
2. (Lame) Any of you want some pi?
3. OMG. That person just recited pi. Call 911!!!
4. Do you wnat blubery pi, pech pi, or stobery yogrt pi?
by Rand0mS7uff5 February 06, 2015

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Pi
The correct way of spelling pie when doing math.
The area of a circle is ∏r^2; The radius of the pie squared.
by JHVH November 13, 2010

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Abbreviation of:

Prison Issue

Used to describe someone who looks like they are straight outta the slamma

Or perhaps a weapon can be P.I. like a handcrafted knife would be P.I. shit
Lets say your at a Denny's Restaurant and your waitress has more tattoos than a Miami Inc. Banner than she would be considered P.I.

Everyone would refer to her as P.I.
by Alphie82 June 12, 2009

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