How much will suspensions reflect my college resume?

You had better hope a college doesn't see any of that. It shows lack of maturity and lack of respect for your fellow students. Since this is not an isolated case where you learned your lesson, this could be a problem down the road. You might talk to the disciplinarian and explain that it was not harment and that you will never do anything like that again. Take your friend with you so you can prove there was not any perceived harment. Good luck!