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To watch porn.

A blue film, blue picture, or bf is a euphemistic term used in India, Sri Lanka, Israel and Nepal for an adult film, often made by amateurs or shot in a style recalling amateur porn.

The term blue picture comes from Great Britain, where blue is euphemistically used to refer to works targeting the prurient interest or those that are considered offensive, obscene or in bad taste.
Hey, were you watching blue?
by harryl June 05, 2014
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