What is a "poster dunk" in basketball?

A "poster dunk" refers to a slam dunk executed over a defender in a dominating fashion, often eliciting an intense reaction from spectators and commentators alike. The term "poster" originates from the imagery commonly seen on promotional posters, where a player appears to soar above a rival in mid-air, displaying their athleticism and skill. This type of dunk is notable not just for its mechanical execution but also for the narrative it creates in a game, often highlighting a pivotal moment. This widespread reaction can boost a player's confidence and energize their team, as it showcases both individual prowess and the dynamic nature of the game.

The other options do not capture the essence of a poster dunk: a slam dunk without significant defensive pressure lacks the drama and excitement that defines a poster dunk. A jump shot from beyond the arc is unrelated to the concept of a dunk altogether, while a missed shot rebounding off the backboard does not involve scoring and thus doesn't fit the definition of a dunk in any context.