A "head job" is when someone tries to say or do something that totally confuses you, so that you can't believe anything that's going on.
You Give The First GYM leader a headjob =]
It's likely this will eventually be brought out into the open as these things seldom stay private. You should'nt be doing this at school in the first place. Promise yourself you will not be tempted to do it again. If you two want to continue with this then you should be doing it somewhere private like his or your bedroom. It is not a crime for two boys to be gay but you need to be aware that school is definitely not the place for this.