earphone phaker
When someone puts on earphones like they're doing a magic trick, but they're really listening to your conversation and planning to make fun of you later.
He had earphones on like he was doing a magic trick, but he was listening to my friend talk about my weird taste in food.
She had her earphones on and was planning to make fun of me later because I was talking about my terrible crush.
He had earphones on and was laughing at my friend's terrible dating life.