Originally Posted by CorpFreak
That's called cockstuffing, and said dude cut his cock hole further open with scissors (and stretched said hole) to achieve these possibilities.
If you want to get technical, it's called sounding
and you don't have to cut the urethra to do it. Most people stretch - cutting would be far more likely to cause infection. It's not as dangerous as it seems, as long as it's done properly (slow, with lots of lube), and some females do it as well, but it's not as common.