1. a person who sleeps around slut
2. a person who seeks social acceptance through jokes
3. someone who is smart, pretty, but non-athletic
that girl got a perfect score on the SAT's and she's so pretty but she doesnt play any sports.. what a molly oneil.
A: did you hear emily makeing those dumb jokes this morning? i was going to HURL
B: i know she was being such a molly oneil