A person who can get on your nerves even when they be nice. There are several types of teachers. For example, There is a very chill teacher who just gives you work and doesn't grade anything unless she/ he has to. Another teacher is the one only kiss-ups like, the ones who shushes you if you talk, and if you interupt her while she talking she gonna tell you to raise your hand and when you do she says, "put your hand down".
Teacher: Now class as you can see on the board there is a--
Student: Can I go to the bathroom?
Teacher: Raise your hand, I'm talking Student: *raises hand*
Teacher: Put your hand down.
An unsuccessful person who tries to teach others how to be successful. People who are teachers are usually people who wanted to chase their dream and be successful in life but failed and had to be a teacher instead.