O-Fuck-Ashima 

A Japanese phrase meaning, "This is not good."

Sir! We've successfully shut down the plant after the earthquake.

Very good. By the way, did you notice that giant Tsunami heading straight for us?

No. (looks out window) O-Fuck-Ashima!

O-Fuck-Ashima by pfc. Snowball April 1, 2011

O.T.T.E.R. 

AN Acromyn for an extremely top secret Emergency Reaction team. Other Tactical Teams for Emergency Responce, aka (OTTER Teams) are a top-secret force of elite military and law-enforcement members with missions so covert and dangerous, even the teams' existence has never been revelaled until now.

OTTER's trace their roots to the Riverine warfare of the VietNam war, and have been active on all continents and regions of the world since that time period.

If you are trying to blow up some of OUR shit, the Mother-fucking O.T.T.E.R.'s will find and kill you......

O.T.T.E.R. by OTTER 125974 October 28, 2010

o g 

Olive Garden - an American Institution

Let's go to the o g.

o g by girly girl 123 November 13, 2010

o g no 

Short for "oh god no."

Said by Will (Eric McCormack) on Will and Grace.

dude1: Do you think her mom is fantabulous?
dude2: Yes!
dude1: What about her grandma? Is her grandma wondermous?
dude2: o g no.

o g no by lizisawesome May 22, 2006

O DER 

A less serious variation of oh dear that has been reduced to four letters due to thermal expansion; for you see, for every expansion, there is an opposite (but absolutely not equal) compression.

O DER, I seem to have misplaced my second to most favorite lung into a blender whose blades are rotating at plentysix miles per hour!

O DER by Shadow Scythe XXVI January 5, 2009

O.C.C. One Character Comeback

Stands for "one character comeback." Mainly used in fighting games such as Marvel vs. Capcom 2 or Capcom vs. SNK 2. It is where you beat your opponent (more than 60% of his life) with just your last character. Definition was originally created by Megaman DS.

Justin Wong OCCd Desmond by killing off all 3 of his characters with just 1% life left only on his Cable.

O.C.C. One Character Comeback by Hellfromabove May 13, 2005

O-YEAH

A word used when happy...Or excited about something....

Person one: Are you going to the club tonight?
Person two: O-YEAH!!!!

O-YEAH by KIRSTEN LANGLEY June 16, 2006