Cheese touch is a game that originated from a moldy piece of cheese on the basketball court.
The cheese had been sitting on the basketball court since last spring, and nobody would play basketball on that court, even though it was the only court with a net. A kid named Darren Walsh touched the cheese, therefore, starting the cheese touch. Then, it spread around the school.
If you get the cheese touch, you're stuck with it until you pass it on to someone else. If you cross your fingers, you can avoid getting cheese touch.
The parodies state that if you get stuck with the cheese touch for long enough, you get stuck with it forever and the only person you can give it to is the person that gave it to you. Also, over 3 months you develop STDs like HIV and herpes.