A particle of nasal excrement launched at such high speed as to achieve escape velocity. It may be launched by way of a sneeze, or the "cover one nostril and blow" method.

When you plug one nostril with your finger, and blow out of the other nostril with everything you have, sending a snot projectile out of the nose.

To blow one's nose by blocking one nostril with a finger and blowing snot from the other nostril onto the floor or ground. See Farmer Snort.

When you plug/cover/pinch one nostril closed and then blow hard to make unwanted snot shoot out the other nostril. Sometimes when suffering from a cold, snot rockets can be achieved by the nose alone, without intervention from the hands. The primary purpose of the "rocket" is to avoid leaving any snot residue left behind. The idea is to blow the snot out fast enough so that it has no chance of sticking to the end of your nostril. Snot rockets are enacted primarily in situations when tissue is desperately needed but unavailable, or it is done simply for recreation.

What my boyfriend did on a date.

When a projectile booger comes shooting out of a person's nostril.

The resulting visual when a large gooey slimy snot is launched in a magnificent trajectory from ones nostrils due to vociferous laughing, sneezing, or crying. The trajectory has been known to reach an apogee of 3 to 4 feet above the launch site. These are especially delicious when they land on someone or something that has a deep fear of this sort of occurrence.