:cO 

Digital O-Face. A replacement for the smiley face when sexting, generally used after a steamy hot sexual innuendo. It can also be used in stealth form by those with dirty minds during general text conversation, when an accidental innuendo is encountered.

Brittany: Do you want me to grab your package?
Kevin: :cO

:cO by Jean Jacker March 26, 2011

CO 

Corrections Officer, ie, Prison Guard.

The CO's put the joint on lockdown...

CO by Slick Willy May 13, 2005

CO 

A term used to refer to a corrections officer.

Shithead CO's often turn a blind eye to jailhouse violence.

CO by Tim April 10, 2005

co 

Short term in the military for Commanding Officer.

Where can I find a CO?

co by Bobby De Niro August 4, 2004

/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.

/co/ is...um...oh fine, YOU come up with a better example then.

/co/ by Gravija May 15, 2008

/co/ 

Comics and Cartoons board on 4chan. Inhabited by:

* Fanboys of My Little Pony, Adventure Time, The Regular Show, and Homestuck (the en vogue series as of May 2011) whom will flood the board with general threads.

* Adult men who idolize comic book superheroes.

* "Nostalgia goggled" anons who think 80's - early 00's cartoons are some of the best ever simply because they were childhood favorites.

* Trolls who post fetish drawings or laughably terrible deviantart drawings.

Typical /co/ thread

OP: What was the best cartoon ever? I vote for Dexter's Laboratory. (pic is most likely a fetish image of an anime Dexter getting his feet tickled by a foot fetishist)
Anon #1: Ed, Edd n Eddy was the best cartoon ever made!
Anon #2: lol faggot. Pre-movie Spongebob was!
Anon #3: Adventure Time is, no contest.
Anon #4: newfags, Looney Tunes was.
Everyone: >>Anon#4 take off your nostalgia goggles nigger! (irony)

/co/ by Phil Bi The Science Guy May 31, 2011

.co 

A new domain name extension that rose to popularity in mid 2010 due to an overwhelming majority of youth (mostly American) who couldn't be f*cked typing the letter 'm' for the previously popular extension '.com'

dotco (.co)
i want to visit the apple website...
www.apple.com WRONG
apple.com WRONG
apple.co WIN

.co by mike nn July 20, 2010