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A Jabunga is someone or something that gives zero mercy and doesn't care if you die slow or fast.
My math teacher is a Jabunga. She failed me for not doing homework. I had to do 100 problems for 10 minutes straight.
My brother is a Jabunga. He won't let me play video games until I finish my chores.
My mom called my dad a Jabunga because he ate the last slice of pizza.