A mash-up of "flashback" and "Facebooking." Occurs when a friend likes/comments on an embarrassingFacebook 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.
Ariana: I think Mikey is high..
Justin: Nah, she is having a Vietnam Flashback from when she was on Hannah Montana.
Selena: I get it. Disney is awful.
Ariana: Yeah, Nickelodeon is better.
Indirect breach of the fourth wall at the end of the movie "Fight Club". When the plot comes around to the opening scene again after two hours of flashback, the Narrator (Edward Norton) states he "still hasn't anything to say", and Tyler Durden (Brad Pitt) refers to this as "flashback humour".