The aim of my thesis is to investigate the use of slang, taboo language and euphemism in English. An important thought we have to consider is that language is a significant means in social communication among people. It is argued that speech communicates phonological, grammatical and semantic information, and it also conveys emotional meaning. Both speech and emotions are universal features of human beings. Previous studies of language have neglected the emotional aspects of speech, but human language does not exist apart from human emotions. People are able to respond emotionally to language. Slang, verbal taboo and euphemism form a very important part of emotive language, because they are emotionally powerful. Hayakawa (1941:195) refers to slang ―as the poetry of everyday life which vividly expresses people‘s feelings about life and about the things they encounter in life.‖ It is also true for verbal taboos that they permit the speaker to express strong emotions and to produce an emotional impact on the listener. Taboo language, such as swearing frequently causes face-loss or offence to the listener.