Yes, it’s a form of PE (Penis Enlargement) involving a slow milking motion using the thumb and fore fingers of both hands in an “ok” configuration. If you really want to learn about it, then visit Thunders place, as your question here will only receive a load of negative comment. There’s also a danger of not getting the right kind of information (which is quite extensive and too much to try and put up on a message board) and unless you learn to do it properly there is a chance of injury. One thing I will say however, though you’ll probably get to realise this, is when the word ‘grip’ is used, it doesn’t mean strangle the life out of your cock. Just a gentle firm pressure, enough to perform the stroke is all that’s required.