Need help! I burned a hole in my bf's parents couch!!!?

If you really want to make a good impression on the parents then you will show them integrity by telling them what happened, apologizing and uring them that you will not be involved in any more incidents while in their house. If you don't like that answer than I'd say the only two options you have would be to take the couch to an upholstery shop to be professionally repaired or cover the hole up with a pillow or something. Whatever you do, learn from your mistakes like we all have and find a better group activity to participate in other than smoking from a hookah. Today it's a couch. Tomorrow it could be a whole house that's burned. You never know, but I'm willing to bet you don't want to find out.