There is a growing phenomenon, worldwide, of inserting English words, phrases or expressions, into the local language: this is part of the acceptance of English as current world language. Indonesia is experiencing the use of this mixture of language when using either their own Indonesian or local language; English words, phrases and expressions are inserted into conversations and written expressions. The incorporation of foreign language words or expressions into a local language is conducted in a variety of events by different sectors of the community. It is carried out by people who have varying levels of familiarity with both the local and a foreign language or languages. This article discusses the use of language mixture in Indonesia and investigates the use of English words and phrases inserted into Indonesian language.