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When you turn your MacBook's screen all the way down so it's totally black and then use it like a mirror to check your face. Girls in college do this a lot, trying not to look too obvious while they fix their hair, redo their lipstick, or just stare at themselves like they're the main character of a bad movie.
I turned my screen to black and fixed my bangs like I was prepping for a royal wedding.
He tried to look cool while using his MacBook as a mirror, but his hair was still a mess.
She used her laptop like a mirror and laughed at herself for looking like a tired raccoon.