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A mash-up of "flashback" and "Facebooking." Occurs when a friend likes/comments on an embarrassing Facebook status or photo from many years ago, causing it to go to everyone's newsfeed, thus making the person ashamed of their stupidity/awful haircut/mirror selfie.
Erica was Flashbooking last night and got me good. I forgot I still had those selfie's from high school bandcamp on my Facebook.
by The Pilge April 16, 2014
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