“That slaps,” for something good, e.g.

SLANG

Think of how younger generations might casually describe something as excellent or impressive in conversation. This term refers to the informal, ever-changing language they use.

This clue plays on modern slang where "that slaps" means something is really good or impressive. The word "slaps" here isn’t about hitting—it’s a casual term for something excellent, like a great song or meal. The clue hints that "slaps" itself is an example of slang, so the answer is simply "SLANG," the category of informal words like this. It’s a self-referential trick where the example points to the broader term.