Iron juice means close friends. More common in the northern region and between brothers in the northern region. There are also between the opposite sex, but they are rarely used. Generally speaking, it is the relationship between bosom friend and bosom friend. This word can be used between men and women as well as between men and women.
Friends and brothers who are playing faster in Aauto now, as well as gold owners who brush gifts, iron fans who are very popular and tourists who are watching the fun can all be called "old iron". Nearly half of this joke called Lao Tie is in it.