Dink water
A glass of liquid that has been used to wash your sink in.
Dude, I washed my dink in a glass one night before Becky came over for sexy time. After we were done the deed she reached over and drank my dink water. She asked me why I had a glass of salt water next to my bed. I couldn’t break it to her that I had washed my dink in it quickly before she came over.