1) When one is pissing at the urinal, looks to the side and sees someone who greets them, or knows them.
2) Any awkward situation which resembles the situation above. Not necessarily male oriented.
3) Like being stuck between a rock and a hard place.
person 1: "I looked to the left and saw my prof. He smiled at me."
person 2: "How did you deal with that urinal situation?"
person 1: "I smiled back."
person 1:"Was waiting in line with my girlfriend at the pharmacy when I realized my ex and her boyfriend were waiting in line behind us. We were both buying the pill."
person 2: "I'm glad I wasn't apart of that urinal situation."