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A wannabe biker gang full of uneducated illiterates that think they are tough shit. They dress and act like a biker gang but don't even own motorcycles and are the ugliest looking rejects you will probably encounter in New Zealand. They roll around in groups acting all staunch and tough but never fight one on one because they are cowards and can't really defend themselves alone. The majority of their members are Maori and Pacific Islanders which is ironic considering their symbol of choice is a black swastika with a red background or a British bulldog with a German WW2 helmet. Their supposedly arch-rivals are another wannabe biker gang called The Black Power.
Person 1: What's that ugly looking ape-like creature in the black and red vest?

Person 2: That's one of those Mongrel mob members, don't worry he's all alone so he won't start shit.
by John Key NZ February 01, 2013
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New Zealand gang.

'Mobsters' are mostly Male but Females are known to join.
Predominently a Maori gang but can include Caucasian and Pacific Island members.

Chapters include eg 'Aotearoa', 'Rogues',
'Notorious', 'Mighty Mongrel Mob (MMM)' and others throughout the country.

Patches include Red and Black colours, American bulldog symbol also used.

Rival of 'Black Power' gang.

Refer to each other as dogs.
eg "What you been up to dog?".

Bark like dogs as a show of power and respect for the gang.
eg When being convicted in a courthouse.

The 'Surfy' (thumb and pinky finger) hand gesture is widely used among members.

To get "patched up" males must undergo severe beatings from other members and if they can handle it they then become the rank of "prospect" in which they must do as asked by senior ranks and are usually used to commit smalltime crimes
eg car theft, burglaries, selling drugs etc

For woman they are given the choice of getting the "beats" or "the block" where they are forced into having abusive sex with numerous members of the gang as others watch.
"Police report a rise in recent gang tension between Mongrel Mob and Black Power members"

"Sieg heil!!"
"Sieg fuck!!"
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