Off the wall Definition 1 of 3Pro Tip 1/3Unusual Humor Used to describe a specific kind of humor that is strange and unexpected. His off the wall jokes had us all in stitches. Pro Tip 2/3Colloquial Charm It's informal, so fit it into casual conversations rather than formal documents. We loved her off the wall outfit at the casual party. Pro Tip 3/3Creative Concepts Indicates originality, often a compliment to someone's creativity. Your off the wall concept for the project was a game-changer.