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A stupid word you yell at someone or something because they are making your life a living hell or just being an idiot.
Why is my math teacher a jackernape? She gave me a 23 on my test and I had to eat my lunch in the hallway.
My dog is a jackernape. He peed on my new shoes and then took a nap on my face.
My brother is a jackernape. He stole my Xbox and now I have to play on his stupid phone.