Someone who is so stupid, you can't do anything to help them.
Teenage girl 1: I heart twilight!!!! <3 <3
Teenage girl 2: wow. you are such a lost kid
Teenage girl 1: i h8 harry potter its so gay
Teenage girl 2: yeah, it's not right to use gay as a negative word, it's derogative.
Teenage girl 1: i dont care. its how i live my lyf.
Teenage girl 2: Okay, I'm not gonna waste my time on a lost kid like you.