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colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech firewall - (colloquial) the application of maximum thrust; he moved the throttle to the firewall
This would be the languge, words and phrases used in casual situations by the people, as opposed to formal language.   Colloquial refers to ways things are said in a local area, that might be different to other parts. It is a local slang. An example of colloquial diction in a literary piece can be seen in Mark Twain's Huckleberry Finn, where the main characters Huck and especially Jim (the black slave) speak using slang.