O-M-J 

Oh My Jesus! A more dramatic way to say OMG. It should be used sarcastically and dramatically to emphasize whatever situation O-M-J was said to. O-M-J and Oh My Jesus are interchangeable but if you say the complete phrase, don't forget to emphasize Jeeeeeesus!

O-M-J that bitch looks busted!

Oh My Jeeesus! That bitch is getting crazy!

O-M-J by CASH $ G G G G G-UNIT! November 14, 2011

O'ing 

The act of placing bright orange Os on Police cars or vehicles of other significant importance. A point system is in place: e.g. Full size SUVs with the engine running and a fully uniformed officer inside counts as 100 points

We went Oing last night and Matt got 100 points for walking up to a suv police unit and 'slapped an O' with the engine running and a cop watching him

O'ing by Crazy Pigga October 10, 2004

O.D. 

over-doing something

he O.D.ed with that fight

O.D. by toudai_ronin April 13, 2003

O-Zone 

The best band in the world! So incredibly hot! Dan Balan,Arsenie Todiras and Radu Sirbu from Moldova are my lovers. They have catchy songs,that are in Romanian. Gotta love the language. They won Best National/International song at the 2005 Echo Awards for Dragostea Din Tei. In your face Haiducii !!!

"Hey,who is the best band in the world?" "O-Zone of course!!!"

O-Zone by Mrs.Sirbu April 30, 2005

O DEAR 

when somebody says something so utterly stupid that it simply has to be shouted sarcastically accross the room

aimee: are polar bears made out of fibre-glass?
frank: O DEAR!!!

O DEAR by Tom Joyce May 24, 2006

o'dell

An Irish Lastname, usually the last name of a person who likes to get hammered drunk (hence the irish) and/or buckwild. Fun person!

person 1: "Look at ryan over there, hes sooo drunk!"

person 2: "dude, he's an o'dell, this is what hes sopose to do!"

o'dell by how2rakelle February 21, 2009

O G 

O G means original gangsta
those tru gangstas from way back in the day that jacked ya and left nothing but you boxers and socks

Biggie and tupac were both OG's

O G by James White July 10, 2004