Used in a similar fashion as John Doe, except used to describe a generic boy from Northern NJ/NY corridor. It is possible to see varying dress, especially for Long Island plain jons, but typical garb includes plain no logo t shirts and sweats. Typically of the white boy wigger white T variety, but can vary. Basketball shorts, however, are a necessity to being a plain jon.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life