You know the posters—the ones you had of Julius Erving or Michael Jordan dunking hanging on your wall (or Vince Carter depending on when you grew up).
There's two ways to get on those posters. You're either the guy doing the dunking or the one receiving the dunking. The latter is doing what is being referred to as being "posterized," which is when you get put on someone else's poster.
Here are the top 10 posterizing dunks I can find from the last 10 years, though I'm sure you'll find more. Feel free to add the links in the comment section.