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1.
PBO
Stands for: Penis Break Out.

Defined as when a dude has a boner
Wow, did you just see Rick? He had a PBO when you were talking to him!
by lowielawlperson January 15, 2011
 
2.
PBO
President Barack Obama
PBO is the 44th President of the United States.
by duster2 January 23, 2009
 
3.
pbo
short text or respond for "Playing Black Ops when you cant text the whole thing out when your in the middle or a match or zombie game.
person1- "yo that one trick keep textin you"
person2- "tell that bitch im in the middle of a game of Team death match"
person1- "nah man thats too much to text"
person2- "just put PBO"
person1- "what the fuck that mean?"
person2- "Playing Black Ops"
by moosebeesmokin420 September 16, 2011
 
4.
PBO
Prime Bagging Opportunity (or PBY, Y being years)
when a guy is say 32 years old he would be in his Prime Bagging Years or have a Prime Bagging Opportunity to bang women from the legal limit to say 50 years old. Any older and they chicks do not fit into the PBO / PBY model.
by areyoukiddingme August 20, 2009
 
5.
PBO
Probly be ok
Pilot: "what about the hydraulics?"
Mechanic: "It's PBO"
by Kurt May 14, 2004