2. Something you had better do when you are in jail or prison, so your cellmate(s) don't/doesn't give you a beatdown. LOL!
3. If it smells bad to you, how much worse will it smell to the other person if you don't have the common sense, or the decency to do a courtesy flush.
EX: Dude! Could you at LEAST do a courtesy flush!?!?!?!?
EX 2: If you don't do a courtesy flush you'll be getting a blanket party tonight!
Ex 3: If you don't want a swirly. gimme a courtesy flush over there.