Goof/ɡuːf/ Definition 1 of 4Pro Tip 1/3Playful Insult Used affectionately about friends making silly mistakes without causing harm. Don't worry, you big goof, we all forget things sometimes! Pro Tip 2/3Not Harsh 'Goof' is softer than 'fool' or 'idiot' and doesn't sound as harsh. She's just a goof, not someone you should be mad at. Pro Tip 3/3Amusing Situations Often used when someone's mistakes lead to funny or entertaining outcomes. Our class goof always has a funny story about his mishaps.