O'Malley 

The name of the alter-ego aggressive AI that inhabited the bodies of Tex, Caboose, and now Doc.

"I told you, my name's not Caboose... my name's... O'malley..."

O'Malley by Speaker for the Dead June 1, 2004

o rly

Used as a verbal equivalent to the body language of the 'raised eyebrow'.

"Sometimes I like to walk around the house naked"

"O rly?"

o rly by Luths April 16, 2006

O-Town 

Shortened term for Orlando, Florida.

We be too crunk down in O-Town.

O-Town by Sessa November 2, 2005

o.p. 

Original Poster - Used in forum talk to refer to the person that started the thread.

To the O.P., what did you mean by "x, y and z"

o.p. by Evan Neus May 30, 2007

O Re Piya-ed 

Adj.

1) The state of being emo

A: Why are you so upset...WE'RE AT DECA?
J: Sorry, I'm just a little O Re Piya-ed out.

O Re Piya-ed by lovesickemo191 August 5, 2008

o_o 

When you are compelled to say something, but lack the subject matter.

Used in place of " Ok... " or " Right... ", etc.

"Dude, I just killed my mother."
"o_o..."

o_o by CoreyD April 3, 2005

O.D. 

over dose

I o.d.ed on crack.

O.D. by The Dickey March 15, 2003