/slæŋ ||; slæŋ/noun [U] very informal words and expressions that are more common in spoken language. Slang is sometimes used only by a particular group of people (for example students, young people, criminals) and often stays in fashion for a short time. Some slang is not polite. 俚语: ‘Fag’ is slang for ‘cigarette’ in British English. fag在英国英语里是俚语，指香烟。