My in laws shared this with us in an email and I thought I would share it with all of you.
In Marble Arch, London there is an old Hotel/Pub which used to have gallows adjacent to it. A prisoner, who was to be hung, was taken in a horse drawn dray, accompanied by a guard, who would stop the dray outside the pub. The guard would ask the prisoner if he would like "ONE LAST DRINK".
If the prisoner said yes it was referred to as, "ONE FOR THE ROAD" and if he declined that prisoner was "ON THE WAGON"
They used to use urine to tan animal skins, so families used to all pee in a pot and then once a day it was taken and sold to the tannery.
If you had to do this to survive you were "Piss Poor". Worse then that were the really poor folk who couldn't even afford to buy a pot they "Didn't have a pot to piss in" and they were the lowest of the low.