ear hustler
A person who sneaks up and listens in on other people’s secrets. They usually do it just to make others look stupid later.
He listened to my crush’s conversation and told the whole school. I was embarrassed, and he was laughing.
She heard the teacher’s password and used it to log in. The teacher was confused, and I was amused.
He eavesdropped on the lunch plans and showed up at every table. Everyone was confused, and he was full.