A heads up offered by a look out that an invidual not down with, adapted to acceptance of, or directly invovled with the groups illegal activity, such as the buying or selling of illegal drugs, is approaching. The invidual is a stranger and without right or reason to be there, even if the place is public, as it is gang territory.

5 0 call is offered without regard to whether the stranger is or is not a member of law enforcement; it is determined soley on trust i.e. whether that person is cool in the cultural sense, not the popular sense.
Example 1: A citizen walks through an area of illegal activity where they don't live or are not know.
The look out yells, "5 0 fool."
by Fred Flinkerstone July 11, 2008
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(Five oh) slang for Sheriff's Office.

Many gang phrases, names and terminologies are translated into symbols. Often numbers are relate to letters in the alphabet and at times simply utilizing the shape of the number as a letter. In this case 5 = S for Sheriff and 0 = O for Office.
Stow that piece. 5 0 (five oh) is rollin' up.
translates: Hide that gun. The Sheriff's Office is coming.
by DC Blue January 30, 2018
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The police. People on the street call out 5-0 to alert the presence of the police.
Yo I saw 5-0 pulling up on the spot yesterday.
by jknHassan December 3, 2014
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Originally a slang term for cops that drove 5.0 liter 302 cubic inch V8 Foxbody Mustangs from the 80's-00's even though the Foxbody Mustangs ended production in 1993. Now it's just a slang term for cop.
Oh crap, the 5-0 is chasing us in a Mustang.
by ATX-CVPI July 18, 2019
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Whereas 5 0 refers to the police generally, Johnny 5 0 is slang for a specific cop- as in, the 5 0 are on their way to arrest you, but Johnny 5 0 is the guy who actually puts you in those cuffs.
I was walking down the street minding my own business, when Johnny 5 0 popped up outta nowhere and asked me for my ID. Naturally, I got the fuck outta dodge as fast as I could.
by ACAB69420 September 3, 2019
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Verb: The act of driving past a speed trap, then looking in your rear view mirror to see if the police are chasing you.
Even when I am driving under the speed limit, I always do a 5-0 lookback until my heart rate is back under a 100 bpm.
by jharmless August 3, 2015
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Undercover policewoman dressed as a prostitute. From ho short form of whore, and 5-0 slang for police.
Girl walking up to car: Hey big boy, you want a good time?
Guy in car: Mos definitely, how much green you askin? I got a fitty right here girl...
Girl: Yeah? Well tonight's not your lucky night buster'cos I'm a cop and you're under arrest.
Guy: Damn ho 5-0!
by PappyDW August 12, 2007
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