a german math teacher is a math teacher that can't properly speak your language, she is constatly preaching about useless stuff in class that you don't need for tests, her name is often Christianne or Miller.
Hey, you learned anything from class? nah my teacher is a german math teacher
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi