One who enjoys watching Grey's Anatomy so much that they begin to turn into the characters...i.e. Cristina Yang (who's a sarcastic bitch)...and so they are not McDreamy...they are McBitchy. But none the less they are loved;)
Audrey: Oh em gee, I'm excited! I just got my hair did!
Becky: Oh cuz we're so excited for you
Nora: Dude Becky is being McBitchy today