the worst teacher in the world super annoying and always pointing stuff out. and sings happy birthday in the most annoying way, if you have him as your teacher I feel sorry for you.
As a verb, it is used to describe a future action in which one exceeds the normal outcome. For example: If you are about to eat more food than average, you might say "I am going to get big in the kitchen." Can be used in a variety of ways: in reference to eating, fighting, taking a test, anything.