Joe Cool

Joe Cool is a persona of studied nonchalance—someone who affects an air of effortless coolness and unflappable calm.

The term originated with Snoopy's alter ego in the Peanuts comic strip, where the beagle would lean against a wall in sunglasses, too hip to care.

Now it describes anyone projecting detached confidence, often with gentle mockery: Look at Joe Cool over there, pretending he's not nervous.

The name suggests the pose may be a performance.