Be/go out of your mind Definition 1 of 4Pro Tip 1/3Strong Emotion Used when feelings are so intense that they're almost unbearable. I was out of my mind with grief when I lost my pet. Pro Tip 2/3Not Literal It's an expression, not a real loss of mental faculties. She was out of her mind with excitement - it's just a saying, she was actually fine. Pro Tip 3/3Temporary State Implies a temporary loss of composure, not a permanent state. When he couldn't find his keys, he was momentarily out of his mind.