1: An ejaculation of mucus
through the nose.
2a: What happens when you laugh so hard phlegm
shoots out of your nose at high speeds.
2b: What happens when you express concentrated emotion through your nose through snorking (surprise), laughing (happiness) or just plain breathing out through your nose waaay too fast* (shocked disbelief).
*Usually happens at the same time as you spit out what ever beverage is in your mouth.
Person 1: (says something funny and unbelieveable) Can you believe that?!?
Person 2: *Laughs so hard phlegm
shoots out through his nose*
Person 1: Woah dude, you just had a major nasal ejaculation!
Person 2: *spits out all liquid contents of mouth and boogeys go flying*
Person 1: Eeew man! You just had a nasal ejaculation
See also: Nasal Ejaculate