I have different methods, depending on where I am. At home it's usually four fingers on the underside and the thumb on top. Of course, I shake it a few times and 'milk' it for the last bit of moisture. Oft-times, I blot with tissue.
In the public rest room, I sometimes piss hand free, really depending on who else is in the process. And, to be honest, I believe I shake and milk it more than in private, as tomarctus indicated he does.
Luke