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.
Chuck used to bike to work even in the winter and would alwaysget a runny nose, which he would take care of with a couple of quick snot rockets in full view of the rush hour traffic.
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.
My nose was starting to run before the track meet, so I ran behind a tree and blew out a massive snot rocket.
Snot rockets are about the only fun part of having a cold. Morning snot rockets in the shower are cherished by many.
(I plug his nose just to annoy him)
(He holds his breath and pushes with his nose)
(I let go - stupidly - only to get snot ALL OVER ME in a RESTAURANT)
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.
I still have flashbacks to the time in 7th grade when I was almost decapitated by my friendCarlos' snot rocket.