People who made it to adulthood without doing anything in life. Commonly they are carried by their parents. They live in the basement/most secluded room in the house, play video games and jerk off all day, eat frozen pizzas and chicken tenders, and usually do this until they're like 50 years old, crusty, and their parents die.
I know a couple. Dropped out of highschool, and have been coasting for over a decade off their rich parents, never leave the house, never had a job. Been that way for over a decade with no signs of change.
I believe it refers to current status, so it's "Not in Education, Employment or Training". Doesn't mean the person cannot have a degree or diploma or at least finished school.
I finish my current job in December and my new job doesn't start until March, for some reason. So I'm going to be Neet for that time. Or does the fact that I have a job, it just hasn't started yet, preclude me
As far as I've seen: usually suicide once they're on their own, body goes unclaimed, and their corpse gets donated for medical research (what happens to unclaims in my state at least).
“Et euh, comment ça s’passe pour les gens comme vous quand y a du soleil ? Enfin, j’veux dire, vous êtes contents qu’y en ait ou ça vous fait chier qu’les pauvres en profitent aussi ?”