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a person who acts like they're the smartest person in the room but secretly think everyone else is a moron and they just wait for someone to make a mistake so they can laugh about it
My math teacher is a real Severus Snape. He acts like I failed the test on purpose.
My mom is a real Severus Snape. She says I'm doing great but I know she's just waiting for me to trip over my own feet.
My brother is a real Severus Snape. He pretends he's helping me with my homework but he's just waiting for me to mess up so he can tease me.