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A person who can break into computers like a thief and is good at it. They usually play video games so much they forget to sleep.
I'm a hacka and I broke into the school's computer system just to change the principal's email to 'jazzmusician@domain. com'.
That hacka logged into my account and posted a picture of my cat wearing a hat.
My cousin is a hacka and he hacked the game so he could have infinite lives.