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6.
5-O
The police. 5-O is the type of engine that police cars use.
"Hey lets get the fuck out of here the 5-O is coming!!"
by Vivianna April 03, 2008
 
1.
5-O
5-O goes back even further than California late 80's. It's origins are a reference to an old 70's TV show called Hawaii 5-0 starring Jack Lord. The police were 5-O and eventually the show lingo caught on as hip among petty criminals in southern California.

"STOP, Hawaii 5-O!!!!"

....blah, blah, blah- small struggles, throw a few punches - handcuffs criminal and stuffs them in the back of a patrol car ....

"Book 'em Danno", said Steve Garrett.
by ex-wife of 5- Oh April 26, 2003
 
2.
5O
The 5O or more appropraitely, 5-O, refers to the police forces, usually by parties that do not like them.
Here comes the 5O, run!
by Gumba Gumba April 14, 2004
 
3.
5-O
5-0 became a slang term for law enforcement (aka police) after the hit show "Hawaii Five-O". The show was centered around a fictional division inside the State-Police of Hawaii and carried the same name as the television show ("Hawaii Five-0". The division's name gets its origin from honoring the fact that Hawaii was the 50th state to become apart of the United States of America.
On a side note, the division was actually called "Hawaii Five-0" (as in Zero, no the letter "o") but IMDB has the show listed with the letter "o" in the tittle.
The Five-0 (5-O)had set-up a speed trap and gave me a hefty ticket!
by RichieV April 12, 2007
 
4.
5-O
police, the cops, po po
yo, it's 5-O
chill man we aint da 5-O
by dbam December 03, 2005
 
5.
5'O
when you're doing something you're not supposed to be doing and someone yells 5'0 that means they're giving you a warning because you're going to get caught
say you're looking through the teachers drawer and your friend is on the look out and see's your teacher coming, he/she will yell 5'O so you can be warned and pretend like you're innocent
by SSSSS333 January 18, 2009
 
7.
5-O
An extremely cheap, pretty harsh vodka. Usually the cheapest you can find, stands for 5 - o clock.
(guy): Man that vodka was dank.

(other guy): Fuck no, that was 5-O.
by Walshyy March 03, 2009