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O'Malley 

Only the COOLEST last name ever!
Person 1:You're so lucky your last name is O'Malley.
Person 2:Uh thanks.
Person 1:Yeah mine sucks.
Person 2:Haha sucks for you.
O'Malley by shanno34 May 4, 2008
Related Words
oof Olivia Owens oliver oscar Obama OK otp ohio oreo
Pronounced like "immunity", but with an "Oh." Military slang referring to the lighter penalties that officers usually recieve when compared to enlisted men.
Captain Williams got transferred, but didn't get relieved like First Sergeant Jones, thanks to his O-munity. They'll probably give him the bronze star to cover it all up.
O-munity by Soldier184 July 28, 2008
On Target On Time.

A statement used by military pilots to say that their ordinance will hit their target exactly at the time planned.
The 123rd Attack Squadron is always O.T.O.T.
O.T.O.T. by AlphaBravo12niner February 17, 2009
The act of opening a snapchat and not responding. Clearly denoted by the hollow square/arrow beside the individual's name.
Girl opens snapchat while with her friend...

"OMG! I can't believe he actually asked me out over snapchat, what a creep!"

"You should totally just ignore him."

"I would never o-bomb someone, I'm not a monster!"
O-Bomb by mixedsignals August 3, 2016

O’Dark-Thirty 

Very early in the morning. O’Dark-thirty is aviator speak for those bleak, lonely hours between midnight and 05:00 am. Those hours when your brain is telling your body to rest, relax, sleep.
"During Basic Training you WILL be getting up at O'Dark Thirty!"
O’Dark-Thirty by chalk757 July 28, 2004
to get away with something even though you are guilty of doing it.
Man Gary O.J.'d me out of the 40 bucks I loaned him! That fucker said I never loaned it to him!
O.j.'d by mooseknuckles November 13, 2002