1. (adj) When a person does something extremely ditsy, almost like a Babysitter's Club character
2. (noun) A person who frequently recites "What is wrong with yowuuu?" or makes a broken wrist while connecting their elbow to the hip while talking
When Michelle was totally annoyed with James during dance practice, James said "Go B.S.C" She replied, "What is wrong with Yowuuuuuuu?"