Hi
Welcome to the world of teenage boys. They all start doing this around 11-12. It gets worse by 14 and then begins to taper off a little after that.
I am totally against hitting an older child on the head in any form. It is a way to humilate, scare, or lash out at older children. They will be embarrassed, scared and angry from it. I know from personal experience. ;-) I never hit my teenagers because I already knew what it felt like.
What we found that was effective was respect. If you can't give me the courtesy and respect of treating me like an adult and acting like an adult, then you don't need have me treat you like an adult. In their teen years they are practicing becoming adults. I told mine, this is your practice time where you learn the correct responses and the correct way to deal with difficult situations (jobs we hate, unreasonable bosses, money issues). I told them it is my job to see that they know what is correct. They need to heed my words and learn it now because when they are 22 and having problems it will be a lot harder to learn it then.
So ask him to take out trash, he says, "Later, I gotta finish my game". I say, "Oh, well let me see if I can afford the electricity that video game is costing me and that I am so kindly sharing with you". In order to back this up you need to learn where the breaker box is, how to flip it to cut off the electricity for that section of the house, and not be afraid to do it. ;-0
My kids have had showers go cold (when they insisted on staying in there way too long). They have lost their electricity, they have not been driven to friends houses because they could not afford the cost of a chaufer (me) and they could not be kind to me to make me even want to be in the room with them.
My husband set this up and encouraged me to use it. It works like a charm. A kid that thinks the world owes him a free lunch, a free bed, a free video game, free shuttle service, free clothes, free everything is in for a big dissappointment when he becomes an adult. He needs to realize now that you have to work for what you want and that when you respect people they will respect you back.
Good luck,
ts