Popular saying, suggesting that the person questioned, by action, saying or appearance is odd too the point of otherworldliness.
Brenda: How great is the next Brittney Spears album going to be? Robert: She has bombed the last two times around. She sucks!
Jason: I think people like to see a healthy woman dance about the stage in tight fitting cloths...
Robert: Man... What planet are you from? She is gianormous!