Sarcastically questioning someone who absolutely has no clue about what's going on in the world and verifies it by talking.
Person 1: Did you get a Covid shot?
Person 2: What's Covid?
Person 1: New to the planet?
Person 1: I've never seen a Tom Hanks movie.
Person 2: You must be new to the planet.
Sarcastically stating or questioning someone who absolutely has no clue about what's going on in the world or has lived a sheltered life and verifies it by talking.
Person 1: Did you get a Covid shot?
Person 2: What's Covid?
Person 1: New to the planet?
Person 1: I've never seen a Tom Hanks movie.
Person 2: You must be new to the planet.