The type of nouveaux riches persons (footballers, successful northern businessmen etc) who inhabit the county of Cheshire, England.
Used as a derogatory term by the 'real' posh of the southeast of England (ie, old money).
'Ooh, just look at that house in Alderley Edge with its carriage lamps, security gates, double garage and immaculate paved drive. Isn't it nice!
'Yes, but a bit 'Cheshire Posh'...