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To jabbawock is to completely wreck someone or something so bad they wish they were dead. Like you kicked their ass and took their lunch money.
My cousin got jabbawocked by my uncle in a video game. He cried like a baby.
That new kid in class got jabbawocked by the principal. He didn't even try.
I got jabbawocked by my sister during a dance-off. I'm still sore.