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Jack special is when you go in a toilet and pee on the floor like a feral animal and if you're extra happy, you might poop on the floor like a feral animal too.
I did a jack special in the school bathroom and the janitor yelled at me like I was a criminal.
My brother did a jack special in the mall toilet and got locked out.
I did a jack special in my mom's car and she was mad for a week.