Top Definition
The postcode for Handsworth, Birmingham, UK. It is known to be the most dangerous suburb in the region and it is where all the crime occurs. It has also hosted some of Britain's most violent riots as well as the country's most notorious gangs.
Often referred to as the ghetto of England.
Yo, don't fuck with me I'm from B21.
by ReloadB21 November 28, 2014
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