Stands for Dumb Ass Girl. Girls are DAGs when they do stuff like act like they smoke and then don't even inhale or other dumb ass stuff like say the Awesome Vipers are small dicked pussy bitches. Girls are especially likely to be DAGs if they are assigned to sit next to me in pre-calculus and their first name is Christina.
Yo Mikey, I did it! I put DAG on the internet. It's in the freaking dictionary, it's totally offical now. How freaking awesome is this? Now everyone in school will know the AV lingo! We are so freaking awesome! Awesome Vipers all day every day baby!