So let me get this straight, you come onto my profile and angrily inquire what I write in my bio? Meeting new people: you're doing it wrong.
Anyway, a simple google search or a nicer way of asking would have resulted in you learning it's from Avatar: The Last Airbender.
I did poorly in high school too, to the point where I could barely think of any schools that would take me. However, I stuck with it and started at a college and really focused on working and now i'm doing a lot better at a university. If you want to try hard, you'll have resources to help you; it's just a matter of whether or not all that work would be worth it to you in the long run :)