I can't believe some of the bad advice on here. . .
First off, don't bite ANYTHING, for all you know this prick has HIV/Hep A/B/C, trust me you do NOT want that scrotes blood in your mouth!
Secondly, is there any chance you can "play the system" so to speak? If he's hit you (more then once from what I understand) why the hell not go tattle? I mean really, almost every school has a "zero tolerance" policy at this point, so rather then getting yourself in trouble by fighting (even if it is self defence) why not just let the school admin kick his ass out?
If that isn't an option (either because your school admin hate you [side note: oh how I'm glad to be out of high school] or for some other reason, and please note "honor" is not a reason to not get authorities involved, there's nothing wrong with manipulating the system

) then I would have to agree with Lee, HIT 'EM. I'm inclined to agree on this one, the kid is most likely a wuss who thinks you'll never fight back, a broken nose may quickly change his mind. Oh speaking of which, using the heel of your palm (
http://www.dynamicselfdefence.com/images/palmfist.gif) give him a swift shot to the nose. You'll most likely break it (and at the very least make it bleed).
On a side note, I would certainly encourage you to get involved with some kind of martial art, there are always going to be bullies in life, and its damn nice to have the confidence to stand up to them. I don't condone starting a fight, but it is sometimes confrontation is invevitable.
So to recap:
if at all possible get authorities higher then yourself to deal with it. If not, you may end up having to take matters into your own hands, just don't go overboard. Hit him once and back off, if he comes at you. . .well use that 2" and 15 lbs well grasshopper
