A sellner
A lanky, brain-dead kid who thinks they're the center of the universe and can't tell the difference between a friend and a person who just says 'hi' once.
'We're besties!', after I said 'hi' in the hallway once.
'I'm so popular!', while no one came to their birthday party.
'I have 50 friends!', but they all live in the same house.