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The full name of a stupid abbreviation. Like when someone says NASA and you're like 'No, it's the National Aeronautics and Space Administration, you dingus.'
My teacher said 'NASA' and I yelled 'That's the National Aeronautics and Space Administration, you idiot!'
My cousin said 'LOL' and I told him it stands for 'Laugh Out Loud, you dumbo.'
I said 'BRB' and my mom said 'That's 'Be Right Back, you twerp.'