Ive done MMA for a number of years and my quick advice for a street fight with a fatty is; 1) Learn to punch if you dont know how to. If you know how to throw a punch it will end the ordeal as quick as possible cause you will maximise your power. 2) Keep your hands up in a guarding position unless you are punching. Keep your fists to your face if not punching. If you are punching with your right make sure your left hand is glued to your face and vice versa. 3) Be aware of your balance/wrestling. Last thing you want is a fatty bull rushing you and you not having your base and you get forced on your back(if you dont know how to fight off your back like most, you will be fucked). I would look up a video of ''sprawling" if you do not already know how to. A good sprawl will turn that bull rush into top control on the ground or in the very least allow you to stand up. This is all assuming his friends dont get involved. Good luck.
edit: Also show no fear, no matter how much is in you. The mental aspect of fighting can be a huge area of leverage if used correctly
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