COS

Abbreviation for "Chamber of Secrets", the second book on J.K. Rowling's Harry Potter.

"cos is my fav book"

by Raqueli88 September 5, 2006

cos

church of satan.

by ... July 1, 2003

CO

Chihuahua Owner. Created because people tended to rage and break their keyboards when forced to type "chihuahua" more than once a day. Chihuahua owners tend to have a nice laugh and lots of younger siblings.

Look its CO, her dog is so cute ♥

by vibrava November 2, 2011

/co/

The Comics & Cartoons board over at 4chan.

Regulars of the board are called /co/mrades.

Often at war with /v/ (Video games) but I don't partake in those.

Better than the shithole they call /b/ will ever be.

I'm a /co/mrade AND DAMN PROUD OF IT

by Gravija May 14, 2008

COS

An abbreviation for Chief of Staff, the best drinker in a group of political workers.

John: Eric was really hammered last night after the fundraiser. He must have had 20 beers.

Jason: Yeah, he’s the COS.

by Bamalama Johnson April 7, 2008

co

meaning "care of" or " company"

co: Ben's Bookstore

or

co: "name of company"

or

John Smith and co. = John Smith and company

by anek June 27, 2006

CO

Chemical formula for Caron Monoxide

Joe: Hmm, I feel dizzy. *Checks boiler* Holly shit..Hey honey! Why is the boiler acting so- *collapses on floor and stops breathing*

by CaptainWhiteyBoy December 15, 2006