Slang is a casual use of language that consists of expressive but nonstandard vocabulary, typically of arbitrary, flashy and often ephemeral coinages and figures of speech.题干所描述的特征符合“俚语（slang）”的定义，即由一些表达力极强但不太标准的词汇，任意的、出现很快但常常稍纵即逝的新词和以自发性或挑逗性为特点的修辞格组成。