in and be somewhat protected from weather. Later, in the Socialist era, the police was issued with brownish vinyl jackets which became rigid in cold weather, and cops started calling them wooden coats, for they felt like actually wearing a guard box, as the name implies. The term is still widely known today. Feds Usually used in the United States to refer to federal law enforcement agencies, especially the Federal Bureau of Investigation and the United States Marshals Service. Also used in Australia to refer to the Australian Federal Police, and in London as general slang for the Metropolitan Police Service, due to influence from U.S. media. Federales Spanish, the Mexican Federal Police. The term gained widespread usage by English-speakers due to its popularization in films. The term is a cognate and counterpart to the slang "Feds" in the United States. Feo A term which indicates a law-enforcement officer approaching the speaker's vicinity. Taken from the Spanish word for "ugly", this slang term is exclusively used by the Puerto Rican and Dominican communities of Philadelphia and (to a lesser extent) New York City, United States. Filth Normally "The Filth", UK, the police. Inspiration for the Irvine Welsh novel Filth. Also common in Ireland, Australia and New Zealand. Five-O Derived from the name of the television series Hawaii Five-O, this term is used in the US. Non-derogatory, e.g.: "If you notice loose plastic cap over the card slot of ATM just call Five-O". It is sometimes shouted out as a warning by lookouts or others engaged in illegal activity when a police officer is spotted. Fízl Czech pejorative term for police officer. Flatfoot A term with uncertain origins. Possibly related to the large amount of walking that a police officer would do; at a time when the condition flat feet became common knowledge, it was assumed that excessive walking was a major cause. Another possible origin is the army's rejection of men with flat feet, who would often take jobs in law enforcement as a backup, particularly during war when established police officers would often join up (or be forced). What is known is that by 1912, flat-footed was an insult among U.S. baseball players, used against players not "on their toes." This may have been applied to police officers sometime later, for similar reasons. Flic A French word for police (singular "un flic", but more commonly used in the plural