To go for a poo during worktime, therefore being paid for it.
So by working extra hours for money you are doing overtime, by taking a dump in work hours you are earning poovertime.
you can work out your average poovertime rate by taking your hourly rate and dividing by 6 (assuming an average 10 minute " visit"). For example, you earn £15 an hour, your average poovertime rate is £2.50 .
" dude, where have you been for the last 10 miutes, its really busy in the office today"
" Been on poovertime and earned £2,50"