A fellow citizen that obeys the laws and respects the rules and guidelines put forth by society. This person is also very helpful and has good morals.
Dude 1: "Dude, you stopped chewing tobacco and drinking and driving?"
Dude 2: "Yeah man, I realized how it was harmful to my health and how I was putting others in risk."
Dude 1: "Wow dude! You've really turned into a genuine upstanding citizen!"
Dude 2: "Heeelllla upstanding!"
When a toilet is so disgusting and covered with piss/ shit you have to hover over the seat to take care of business. Typically performed in public restrooms.
Dude 1: Yo dude, I was taking the browns to the Super Bowl in a Walmart bathroom the other day, the toilet was so gnarly I had to do an upstanding shitizen!