1. The term used by girls ranging from 8th-10th grade to describe guys in their grade as an excuse for becoming sluts to college guys in a higher grade.
2. Used to describe adolescent people who don't drink alcahol, take recreational drugs, drink coffee, sneak out of their house at 1 am, have sex etc...
Kate: The guys in my grade are so immature, which is why I am going out with this new guy.
James: Do I know him, what's his name?
Kate: I don't know but he is 21, has a car and and can buy me and my friends beer
2. Brandon doesn't drink, therefore he is extremely immature