CSO

A phrase coined by the UFC's Tony Ferguson, meaning "Champ Shit Only." Implying that he is the true UFC Lightweight champion of the world.

"Where you at McNuggets, you fucking piece of shit, I'm gonna kick your ass! You better come and defend that belt, defend or vacate motherfucker! CSO motherfucker!"

by meatspin.fr May 6, 2020

CSO

Community Service Officer.
University Employees that provide Escorts and Campus Security. They are often underpaid, overworked and stalked by their clientel.

Can I request an escort from a CSO.
A really cute CSO walked me home last night.

by suptrupe November 23, 2005

CSO

Completely Sold Out
USUALLY in regards to tickets to a concert of event

I hate it when tickets are CSO early

by MannyFresh September 6, 2005

CSO

Catholic schoolgirl Outfit

Hope she wears her CSO to the party; that baby rocks!

by SamBeeGees November 9, 2009

CSO

Complicated Significant Other, for example being friends with someone who rejected you but he's still kinda flirty, etc. There's no other name for your relationship. Can only be used when you're single and he's your or one of your closest things to boyfriend, lover, etc.

"Are you two dating?"
*leans in and whispers*
"he's my CSO I was talking about!"
"Oh!"

by cupcakes3659 December 12, 2016

CSO

Combined Sewage Event: typically used by public works departments to describe the unintended discharge of large quantities of raw sewage into lakes and oceans. CSO can also be effectively applied to the uncontrollable discharge of large quantities of excrement by an individual.

Where is Bob? He's been gone for over an hour.
He's in the bathroom having a CSO.

by THX1137 July 13, 2010

csos

Crakaz shot on sight

policy in many hoodz includin mine REXDALE

CSOS compton, detroit, east la lota stuff

by Desi_Doubkle December 8, 2007