slang 是一个英语单词，
名词、
动词、
形容词，作名词时意思是“
俚语；
行话”，作及物动词时意思是“用俚语说”，作不及物动词时意思是“用粗话骂”，作形容词时意思是“俚语的”。
2、Yes, occasionally, you hear some idioms or slang and do not understand.
3、So the real etymology is that it appeared, evidently as slang, in around 1700.