Definition

An early 2000s exclamation expressing shock, amusement, or schadenfreude at someone else's misfortune or a sick burn. The verbal equivalent of the finger-snap emoji before emojis existed. Often elongated to "Oh, snap!" for maximum dramatic effect when witnessing someone getting roasted.

Example Usage

Snap! Did you just see Marcus get rejected by three different people in five minutes?

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=snap%21&defid=14316)