(UK, US, slang, mostly, in the plural) A policeman.
(UK, US, slang, mostly, in the plural) A policeman.
(UK, air force, _, slang, dated) A member of the air force.
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(slang, derogatory) A police officer.
(slang) A police car.
(US, colloquial) Antipolice.
Slang for a police car, referencing the classic livery of blue-and-white paintwork worn by patrol vehicles in many countries, including the UK and parts of the US. The term strips the vehicle down to its most visible feature — the colour scheme — in the way street slang often reduces authority figures to their most recognisable symbol. Spotting a blue-and-white can signal anything from casual neighbourhood watch awareness to urgent 'heads up' warnings among people who'd rather not be stopped.