Girl who is not in education, employment or training. Usually spends their time girlrotting or engaging with their nerdy interests since they're chronically online. Also typically anti-social and barely touches grass since the outside world is scary. Probably runs on energy drinks and low effort meals (may or may not be stinky.)
Parent's friend: so, what are you doing nowadays, in college, working?
NEET girl: I'm just taking time to figure stuff out.(pretty much has no idea what she's doing in life and doesn't wanna sound like a bum)