Definition of heads - up written for English Language Learners from the Merriam- Webster Learner's Dictionary with audio pronunciations, usage examples, and. It's the game The New York Times called a "Sensation," and Cosmopolitan said " will be the best dollar you've spent." Heads Up! is the fun and. Well, just a heads - up, but saving Alaric's life was a matter of a treatable death wound, perfect timing, and fear of losing the most interesting guy I've dated in a.