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!
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.