Peeing is a very common phenomenon, but can you imagine what a parabolic would be if a person stood on the surface of the moon and peed?
The answer depends on your environment.
If you're in an environment where pressurization and temperature can be controlled, the only difference between the Moon and Earth is gravity, which is 16% of Earth's. This gives a rather boring answer, namely that urinating will only move along a "straighter" arc, or, depending on the trajectory, the urine will walk 2.5 times more than on Earth.
We all know that on Earth, air resistance causes objects to deviate from a perfect parabola, but on the Moon, since there is essentially no atmosphere, urinating will follow a very precise parabola. In fact, if you watch videos of Apollo astronauts flying a lunar rover around the moon, you can see dust being thrown into the air and following these exact curves.
But if we're talking about urinating directly out of your spacesuit when you're standing on the lunar surface, the very low atmospheric pressure on the moon will immediately boil urine. Under the moon's weak gravitational pull, steam would fall to the ground because no atmosphere carries steam.
Wait, do you think the moon is cold, why is it starting to boil?
Matter can be in many different states, the basic three states being solid, liquid and gaseous. The specific state of a particular substance depends only on temperature and pressure. If you think about water (the main ingredient in your peeing) we know, for example, when you climb a mountain, the air pressure drops and the boiling point of the water starts to drop, so at the top of Mount Everest you can make a cup of tea at 71 degrees Celsius.
In the lunar peeing scene, the temperature of the urine is the body temperature, about 37 degrees Celsius, and the pressure in the spacesuit should be the atmospheric pressure of the Earth. Once it enters the lunar environment, the pressure drops by more than 1 trillion times. When urine suddenly finds itself exceeding its boiling point, it immediately boils into steam.
Didn't you think it was funny?