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nd thus created a lot of slang words because of their special social status. The prisoner called the jailer to ‘chaster’; the drug addicts named the drug as ‘bloke, cap, nose candy, grass, heaven dust’; the policeman was called ‘pig, cop, flat foot’ by gangsters. Hence a lot of slang words came into existence, but this origin is also the main reason why a lot of scholars refuse to accept slang for which come from the subculture groups. This kind of slang derived from special environment. Finally, the penetration of culture and language between various social groups becomes the motivation of slang, and which caused the slang to have spread quickly and being popular. The intercommunication of cross-culture prompts the renewing and development of slang. ‘big one’ refers to ‘the stake of 1000 dollars’ which comes from the slang of gambler, and nowadays which becomes the popular slang in the whole society for its high frequency; ‘sack out’ (sleeping) and ‘suck time’ (the rest time) were the popular slang among American army during the World WarⅡ; by the end of the war the two words were brought into daily life and became commonly used words with the veterans. The co-existence of multi-culture caused the first socialization of American slang. C． Psychology The identical or similar outlook on life and society causes slang, and these slang words are widely used among those people who have the same standard for social value. American soldiers who station in foreign land often use ‘liberate’ (to free a person, an animal, or a country) as the meaning of ‘to find a local woman as their paramours’; finally, this word was popular with this meaning among the whole America army. It turns out that slang is the inevitable product of interpersonal communication. The feature of this kind of slang has the function of unity and exclusion among associates. If a person creates a new word, in that way, the word will be circulated among the whole associates. People want to have a good interpersonal relationship, so they usually use the same language style and language speech. The language compromise finally comes about a lot of slang words. The similar compromise also turns up among the groups of consanguinity or intimate relationship. Such kind of psychological interpersonal communication enlarges the vocabulary of slang. D． National Spirit and Character Features of Americans The national spirit and character features of Americans are also embodied by their talking style and language speech. Most Americans stress such characters as ceaseless change, innovation, receptivity, optimism, free, open, which is close to the creation and usage of slang. America people are full of passion, strong curiosity, and adventurous spirit; meanwhile, it is an active race. Their personality is showed by their language. According to Partridge, four features present in all slang, whatever the period and whatever the country, are: the search for novelty, volatility and light-headedness as well as light-heartedness; epheme-reality (19). Otherwise, American slang is widely used by various Americans mainly for its vivid, concise and lively features and humorous and free style. All its features are in agreement with the personality of Americans. Americans tend to accept new things and refuse to the restriction of the Standard English, especially the America youth. They often rebel the traditional notions and don’t surrender to the authority. On the hand of language, they are eager