Al Capone, and The Mafia are "gangster"
Man A: " That dude over there is gangster"
Man B: "Is he in the mafia?"
Man A: "No"
Man B: "Then he is not a gangster"
by ZombieHunterX October 8, 2009
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Fucking retards that always have their pants down to their knees and listen to R.A.P. or Retards Attempting Poetry. They steal cars and hit people with baseball bats and always carry guns and have stupid slut girlfriends who have big asses and who live in a dead guys house and say yo ma dawg im in ferth grade and im 18 and i like to kill people and steal dem carz wit a gun on the west sieeed and then marrrrry a hukker. All of the female rapeoples are stupid talentless hos and the male ones have vaginas. And Usher is a fucking fag who keeps "singing" about some dumb slut who dumped him like 30 years ago. They always insist on having neon lights and hydraulics on their "pimped out" vehicles which always have some faggy decals that look like they ran over an ink bottle. FuCK d3M GaNg5t3rz
McDonalds Gangster Commercial.. "Do u hopes to be getting a big ass meal at a fly price? well now u and ur posse can be snackin for under 7 dollars. no shit! Mcdonalds presents the big mother fucker. Get the big mother with a bottle of Colt .45, Chit-lins, pigs feet on a cornbread biscuit with a big ass bucket of gravy. dis shit be cheaper than 2 hits of crack. and so good you be saying shit dawg. did somebody be sayin' McDonalds? You damn right. McDonalds we loves it when u be smiling!"
by Fat tits fart August 11, 2005
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People who kill, rob and threaten others. Gangs can be big ass and rich like the mafia, but they can also be small and/or poor. Most (american) gangs are founded in California by people who didn't have enough money for a good education or didn't manage to get good jobs even with an education(the educated ones can mostly manage more in a gang than a not educated person).

Gangs usually are used by fakers to act tough like 50 cent(the biggest snitch of all times) The Game(one biggass weirdo) Snoop Dogg(a former gangster who claims to be a crip while he is wearing red, yellow, green and colors used by rival gangs)

Gangs are one of the reasons urban dictionary excists cause people do everything, even risking there live, to find out what them gangsters are saying and alotta slang is born that way.
gangster: Yo c wazz da happz you tappin that shit?
Person: Uhmmm...

5 weeks later.

Person: Were you sayin i had to have sexual intercorse with a poopy?
gangster: What's wrong with you doug?!?!?!

Gangsters do their thang.
by 187Crip July 18, 2006
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Taking a crap, usually 2-3 flushes (since it is going to be bad assed like a gangster). This is because your crap resembles a gangster, being brown in nature and quite violent sometimes. Having the "gangsters" implies diarreah.
Excuse me from dinner, for I am going to take a gangster.

Oh no, I think i have a case of the Gangsters!
by Demonz566 August 31, 2007
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A member of a gang. "Gangsters" refers back to the 1920s during Prohibition era when alcohol was illegal. Gangsters would bootleg alcohol to be sold at speakeasies. In the 21st century, the new term is "Gangsta," which is really a person, usually a lower-middle class or poor African-American male, who dons the title to intimidate others. Often in the right situations "gangstas" are the first to run away in scenarios that they claim to always see.
Gangster:

Mary: Did you see that gangster film?
John: "Scarface?" Yeah, that's a classic!

Gangsta:

Travis: Hey, yo! I'm a true gangsta! I own a gun and have been capped.
by Mistress Anarchy April 10, 2009
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When someone or something got destroyed in a way where only someone or something truly gangster could be responsible.
Person #1: Did you see the video of the guy that got his arm torn off by an attack dog?
Person #2: Yeah. He got gangstered.

(the dog was gangster).
by AlleMuligeTing July 11, 2019
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