Some dude who has studied a martial art (such as karate), and therefore thinks he is really bad ass, but then some bully comes along, tackles him, and punches his face in. Funny, because it sounds like "Karate Kid".
Simon took up a stance and told Jake to back off or he would have to teach him a lesson. I think he said something like "Get lost or I'll give you a free karate lesson, whether you like it or not." Jake, voted MVP on the wrestling team, beat the fuck out of that twit! What a CRUDDY KID!