Grenade out is a familiar callout in shooter games and action scenes, where a player warns teammates before throwing an explosive. The two-word warning is easy to recognise even without context, which helped it travel beyond gameplay into short-form video, memes, and reaction edits. Creators now use it as shorthand for incoming chaos, a bad decision, or a moment that is about to escalate quickly. Its appeal is its brevity: the warning is clear, urgent, and immediately followed by an expectation of impact.