In slang, it has several meanings, but all come of expression " spur " that is " pay " " pay with money ". Cat is a prostitute - that has to pay - although originally was always a known figure ( dancer, actress, vedette ) that it exercised his profession in a more discreet manner. Also called cat that comes to accounts to another, as in the prison where the bodyguard of a Pavilion send your cat to other inmates paid services of protection or any other benefit.
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