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The poshster is a person chilling out in West London, but living in East London. Or vice versa.

In summary, too hipster for South kensigton, but too posh for Brixton, though hanging out in both areas.
Hey man, stop being such a poshster! Forget about Chelsea/Mayfair/Knightsbridge/South Ken this evening, just stay locally for a drink in Shoreditch/Bermondsey/Dalston/Brixton {pick your favourites}.
by VinnieZePooh August 06, 2015
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