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6.
Not to be confused with football/soccer firms. Firm (which in this context has exactly the same meaning as mafia) is a term used for organised criminal gangs in the United Kingdom, particularly England. Firms usually consist of white Britons, often run by one family. They are usally highly organised and keep very much underground, some firms may get corrupt police and politicions on their side, but in general they try to avoid all forms of authority.

They opperate in very similar ways to other criminal organizations like the Italian/sicilian mafia and Irish mob, like them, firms also have traditional values of respect, looking after your family and the rest of the firm and the code of silence.

Their criminal activities are mainly for financial gain, and they include; drug dealing, gun running, smuggling, extortion, armed robbery, protection rackets, kidnapping, the list goes on. Some larger firms opperate on an international basis, you will find quite a few British firms operating in places like the Costa Del Sol in Spain, and in other parts of Europe too.
Possibly the most well known of all Britains crime firms are, The Kray twins, refered to as "The Firm", they were one of the most notorious gangs in Londons east end in the 60s.

by JAL0KAR July 28, 2008
 
1.
A group of football fans defending honor of their team by fighting other firms . Every team has one , some iven have two.
Arsenal play good football but have a bad firm
by GST October 17, 2005
 
2.
a group of football hooligans, usually made up of 200-300 people, but the best firms have far more than that number.
Millwall, Cardiff City, Stoke City, West Ham, etc.
by International Bad Boy October 26, 2004
 
3.
A Word used by Half Moon Bay High School Students and in a coastal suburb of San Francisco and by College students in San Luis Obispo. Used to describe someone who is on a mission or takes life way too seriously.
"That's Firm"
"Chris just yelled at me because i used his cell phone, he's so firm."
"Harry is wearing his Save By the Bell fan club t-shirt, he's so firm."
by Alex Spieller May 18, 2006
 
4.
A confirmation and salutation. It is used in replace of "Word".
It's meaning is a mixture of "solid" and short for "aFIRMative".
A: "Yo, you swinging by that party tonight?"
B: "Firm"
by Kid Protocol July 14, 2009
 
5.
a gang of football hooligans
by Bigmeuprudeboy September 09, 2003
 
7.
Meaning final price in terms of selling things. Used on Facelist and sometimes Craigslist. If you sell something at firm it means you will go no higher and no lower, it is your final price.
Guy 1 - *Selling a pair of shoes for $30*
Guy 2 - "Will you go down to 20?"
Guy 1 - "No, $30 firm."
by finalpricebitch August 27, 2012