spoiler alert

slang

1. A warning that something divulges a secret or surprise about a piece of media and thus could potentially ruin the experience for someone. Sometimes used as an exclamation or interjection. I've done my best to avoid spoiling surprises in my review, but I've added a spoiler alert near the end when I discuss some plot elements in more detail. A: "I thought the film was good overall, but finding out the protagonist was the killer all along was so jarring." B: "Whoa, spoiler alert, dude!"

2. interjection Used sarcastically to highlight that something is not at all surprising. The book is as hackneyed as you can get, a boilerplate story of good versus evil. Spoiler alert—good wins.