PSO

Platonic Significant Other

A best friend, life partner, whoever you spend time with. Same as S.O. but without sex or romance
NOT friendzoning, neither person wants to date and they're just best friends

My best friend is my PSO, we do everything together and people often ask if we're dating, we're for sure not though

by I don't want my tits anymore September 19, 2022

pso

1. Short for Pelvis Shattering Orgasm - Orgasm that is so good you feel as if your pelvis will shatter.

My boyfriend was wild last night, I had 3 pso's.

by John Wright November 12, 2005

PSO

Perfered sexual orientation

Sorry guys are not my PSO.

by Gracacillian April 1, 2019

PSO Vixens

Bunch of dried up old has-beens who sit on the end of a phone pretending to be young and slim while guys on the other end of the phone jerk off.

The missus is out tonight, I'm gonna rub one off with the PSO Vixens.

by FatBoyBob August 2, 2008