It's simple, really. Just place your genital region over your frag's head, or any other body part for that matter, and simply press the Ctrl key on your keyboard. You can either do it fast; if you're "get in, get out" type of person. Or you can do it slow; if you're a slow and steady person, be sure to do this for about 5-8 seconds.
Now if you are a female for that matter, this trick would be considered as Cunt-Tapping. I have yet to see what this looks like.
Anyways, here is a demonstration of the Tea-Bagging trick in process.