o-d 

Overdoing it, over-dosing

I can't believe she drank that entire wine bottle. That's o-d.
She died because she o-ded on her pills.

o-d by MiSZ N3W YAWK May 15, 2008

o{<]: 

A person riding a skateboard.

a skateboarder, a skater

I was watching the X-Games, on ESPN, and i saw a o{<]: do an intense stunt!

o{<]: by June Une Datery September 29, 2008

O No 

Utilizing words that combine the syllables 'O' and 'No' to refer to a suspect of breaking up something special, bringing to the table similarities to Yoko Ono and The Beatles. Popularized by the HBO series "Flight of the Conchords" (New Zealand's 4th most popular folk parody duo).

Veronica Corningstone:
"Ron, it's the pancake breakfast. We do it every month."
"O No. Ron's ditching us again." You ought O No he would pull this.
Bret's girlfriend Coco, "Flight of the Conchords

O No by William Forrester III February 11, 2009

O.S.F. 

Referring to the One Star Fairy in the CBS forums. An O.S.F. is a Phaenomenon occurence in which every post is rated 1 star out of a possible 5. There is no actual member who is the O.S.F. it is just a speculated phantom. It is mainly associated in the NCIS forums.

I think the O.S.F. has been through here today.

or

The O.S.F. has landed.

O.S.F. by Random Sightings April 16, 2010

O.P.W. ( O.P.Dubs) Optimum Pooping Window

The moment in time when you need to poop and you know for a fact if you do it now it will be a good poop. Waiting past this window results in a less then perfect poop, Usually with not getting it all out or straining harder than you would have had to if you had done it during your O.P.W.

"Gotta go man, just hit my O.P.dubs"

-O.P.W. ( O.P.Dubs) Optimum Pooping Window

O.P.W. ( O.P.Dubs) Optimum Pooping Window by Catrotzuk September 26, 2015

o-face 

Orgasm face, the face you make when you are peaking sexual pleasure and cumming

Sex was awsome last night, I made an o-face

o-face by DizzyLizzy April 1, 2007

o.s. 

abbreviation of "one's self" sometimes used in dictionaries

French dictionary:
s'occuper
- to occupy o.s.
- to keep o.s. busy

o.s. by TomParys March 6, 2013