Group of Teenagers living in and around Berkshire, UK, who believe they are part of the Gangsta scene supposedly found in US Cities. Signs of being part of the Berkshire Posse include:

• Using your allowance to buy small quantities of dope
• Trying to look intimidating outside the local shops/youth club
• Thin growths of hair on upper lip
• An accent containing the worst bits of Queen's English and Gangsta Rapper
• Thinking Ali G is someone to look up to
• A crap metro with the windows painted black and the suspension lowered
• Stupid clothing with large nike, fila or adidas slogans

Just another annoying part of living in the Thames Valley (see also Dot Com madness, Microsoft, High House Prices, Middle Class and boredom)