What does “stylé” mean in French slang?

Stylé looks like “stylish,” but in everyday French it has drifted to a broad “cool / awesome.” C’est trop stylé means “that’s so cool,” the equivalent of c’est top or c’est génial — it can praise a thing, an event or a feat, not just someone’s outfit. Applied to a person, il est stylé still leans toward “he’s got style,” but the runaway slang use is the all-purpose “that’s awesome.”

It belongs to the registre familier and is heard constantly among young people, though plenty of adults use it too. In this clip the class crush is judged trop stylé and il a trop la classe — both ways to say “he’s effortlessly cool.” Keep trop as the intensifier here: trop stylé, trop la classe. A safe, current upgrade from the textbook cool.