You have to both shit and piss in a John Q. Public. When you enter the restroom, you find a Little John awaiting you. Since you have to both shit and piss, you do the "Peter Tucker", ie, tuck your weiner, so as to avoid hitting your peckerhead on the inside of the toilet.
This morning, I woke up with a Woody Johnson, but I also had to piss like a fire hose, so I did the Peter Tucker to avoid getting the John Dickens.