If you want to sit here and be a chicken about it then nothing. If you want to make something happen and not wonder what would have happend then go up to him and talk to him and put your self on his mind.
grab his balls and say "fcuk me you dirty little b@stard". Or just get one of your friends to suss him out and see if he likes you..If he does, which he probably will, get your friend to ask him to meat you somewhere..Then just explain you have an almighty crush on him and he makes your knees quiver and your baldy chicken wet..
Just walk up to him and tell him these exact words "I think ur hot, and I really like u." then walk away like nothing happened, and let him come to u.