Flashbacking 

The action of experiencing a flashback, or a memory of past events.

Person 1: OMG, They are flashbacking on Glee!
Person 2: This happens literally every episode, get with the program.

Flashbacking by vampir3b0y November 27, 2018

Flashbooking 

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.

Flashbooking by The Pilge April 17, 2014

Russian Flashbang Flashbanging 

When you're doing the russian flashbang to a girl then you get raided by the FBI.

"FBI open up!"

Throws flashbang into room

FBI enters room

They see people doing the russian flashbang

The spetsnaz show up and join in

Putin approval.

"I was doing the russian flashbang flashbanging to this girl the other day, you know when you cum in her eyes and tug on her ears at the same time, then I got raided by the FBI... The worst part is that the Spetsnaz joined in."

Russian Flashbang Flashbanging by Cavalirium June 4, 2021

Flatbacking 

A bitch or bird with no job who sleeps around for money and material things.

Yo! How did Shawty get that Gucci Bag, she don't work even no where?

Ans: Shawty be flatbacking.

Flatbacking by V Double November 10, 2010

flashpacking

Backpacking but not on a budget, using First class travel and accomodation. A more 'flash' version of backpacking.

Wow, en suite bathroom in Budapest.You are good at this flashpacking aren't you?

flashpacking by the_fountain_of_all_knowledge November 10, 2008

flashbanging 

The act of crushing dreams.

Ryan is about to get a serious flashbanging.

flashbanging by BJR November 8, 2012

Flashbanging 

Someone says something so so so stupid that it just completely throws you and you briefly consider that you're actually the one whose wrong.

Flashbanging is the stupid person's version of gaslighting.

Flashbanging by John PenBloc July 3, 2018