A pimp is a man who is in charge of prostitutes. He offers them protection and helps them to find clients in exchange for a percentage of their earnings. Prostitution is illegal and so is pimping. In slang terms, a pimp has come to mean someone who has a lot of girlfriends. Pimps are often known for dressing very flashy (at least they do so in Hollywood movies) so to ‘pimp’ something has come to mean dress it up or make it flashy.