Flashback 

A psychological phenomenon in which an individual experiences an episode of some of the subjective effects of LSD (this may be a positive or negative experience) long after the drug has been consumed and worn off -- sometimes weeks or months afterward. Despite anecdotal claims that flashbacks are common, studies have shown that these experiences are relatively rare.

Debate continues over the nature and causes of flashbacks. Some say flashbacks are a manifestation of post-traumatic stress disorder, not directly related to LSD's mechanism, and varying according to the susceptibility of the individual to the disorder. Many emotionally intense experiences can lead to flashbacks when a person is reminded acutely of the original experience.

Several urban legends claim that flashbacks are the result of trace amounts of LSD or related chemicals being dislodged and released into the body after having been crystallized and stored in fat or spinal fluid cells. However, scientific research has disproven this conjecture; LSD is metabolized in the liver, as with many other drugs, and its metabolites are excreted normally in the urine. Drug studies have not confirmed that LSD can cause flashbacks or lasting psychoses

I'm having a flashback. "No you're not!". That's Art Linkletter hype.

Flashback by Cid25 July 6, 2004

flashback 

When a movie or TV program suspends the current events to let the viewers see something that happened in a character's past. Depending on what you're watching, flashbacks are done either to build character/plot or they are simply a way to make a joke out of past events.

"Family Guy is famous for it's random flashbacks"

"Flashbacks are the third deadliest killer in animes; most of time someone dies, it's during a flashback."

flashback by stop taking every name! December 9, 2008

flashback 

When the person you've flashed has flashed you back, presumably in the same method in which you flashed him/her.

I was just screwing around when I flashed her--but I never expected a flashback!

flashback by Number IX January 16, 2013

flashback humour 

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".

Any other definitions for flashback humour?

flashback humour by Fearman December 23, 2007

flashback mary 

too much powder. also a glorious twitter meme.

hi sisters! today we are gonna skip powder in our makeup tutorial because well...flashback mary.

flashback mary by cloutcoins May 15, 2018

flashback mary 

the spirit of those who falsely apply their powder. never summon after midnight. ro summon, spin in a circle three times saying flashback mary.

"flashback mary, flashback mary, flashback mary...HI SISTERS"

flashback mary by sister safe November 12, 2018

Flashback Friday 

Similar to Throwback Thursdays, this is sharing a past post or image on social media sites

A typical social media update:
'It's Flashback Friday. Remember this picture of us?'
#flashbackfriday

Flashback Friday by Parrotscantflylikesuperman November 15, 2013