Common abbrevation for Psionic Energy,
it can also be used as the name of a catagory of skills, often called Psionics.
When you make a PsiBall, you can feel the Psi running through your body.

How long have you been doing Psi?
by PsiZero November 7, 2003
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per square inch

sometimes used in paintball
when using or playing paintball and HPA *high pressure air* their could be 850 psi in a pb tank
by viva la vidaa May 7, 2009
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The letter in the Greek Alphabet that comes after chi and before omega.
alpha, beta, gamma, delta, epsilon, zeta, eta, theta, iota, kappa, lambda, mu, nu, xi, omicron, pi, row, sigma, tau, upsilon, phi, chi, psi, omega
by The Cobbgoblin May 17, 2006
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1. Yo I can't beat this level, the RNG is too crazy
2. Nah man I beat it first try, sounds like your problem is just PSI
by Malixo January 22, 2021
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Pounds per square inch.

If used in the form "That person has a high PSI". It is a sexual reference saying there ass or another part of the body where a penis can be inserted is capable of taking alot of pressure, or quite a hard pounding. Can also reference to the largest penis they can fit in their ass before the pressure gets to high and rips it.
That h0 has a really high max psi.
by Anonymous February 25, 2003
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PSI: A black and white Siberian Husky with one brown eye and one blue eye. The most extravagant Siberian Husky in the United States. He's very loyal, protective, and very athletic. The best friend you will ever have.

Knows his surroundings, capable of saluting, shaking your hand, giving you a high five and knows how to speak.
Psi is the most gifted Siberian Husky a man could ever ask for.
by PsiChase October 6, 2019
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unbelievably sexy, near orgasmic lower back
Jenny's psis is the most beautiful thing in the world.

Lower back right near the dimples.
by ynnej zruk April 1, 2008
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