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flash crush

An infatuation that only lasts for a short amount of time. Generally when you like someone, but are aware that it will not last for much longer than a week.
Girl 1: Natasha is going out with John
Girl 2: Oh really? I had a flash crush on him in the summer
by Janell Marton August 22, 2007
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FlaSh-Lag Effect

-a visual illusion wherein a flash and a moving object that appear in the same location are perceived to be displaced from one another (MacKay, 1958; Nijhawan, 1994). Several explanations for this simple illusion have been explored in the neuroscience literature.

-The illusion has been tested in many aspects, through the game of baseball, and how flashes may affect the batter's perception of the ball.

- "FlaSh-Lag" was also the name of a relatively well known Console and PC Gamer from the years 1999-2004.
Chris Rock: Wow man did you just see how displaced that object was.

Jim Thome: Nah man, the flash just made you think it was displaced, that's called the Flash-Lag Effect
by DontTaseMeBrah May 6, 2011
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flashblack

when you flash back to your blackout night
1: "Yo Billie, I just had a flashblack of what happened at Alibi's last night!!!"

2: "Melia, I just remembered falling on High Street - what a flashblack!"
by 12lamby May 7, 2012
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Flashed Credentials

Flashing or showing your tits (if female) or genitals (male or female) to one or more persons with the intent of attracting their attention and creating a sexual response.
Carla got laid repeatedly over summer break. She just went to the beach and flashed credentials.
by Eaton Holgoode June 7, 2016
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flashing colors

The situation when someone is accidentally or intentionally exposing (showing) colors from their clothing that relate to a gang 'color' causing alarm or suspicion from anyone that notices, especially authorities such as the police.
Young individual walking in the mall wearing all blue: hey why the hell are you questioning and searching me as if I'm carrying any weapons?! What is this the gestapo, I thought this was a free country, I could wear whatever the hell I want!

Two undercover cops: well there's been a gang stabbing here earlier and you were 'flashing colors' (wearing all blue).
by Racer12 July 17, 2009
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Flash Mob

A term used by inner-city youth, usually in a gang and oftentimes African-American. Describes a quick, spontaneous shooting (hence 'flash') of an individual (or perhaps of a small group) by a gang of African-Americans (hence 'mob.')

The term 'flash mob' originated as some kind of strange gimmick where net-savvy nerds met in a public place to do something ridiculous, then quickly disperse.

However, 'flash mob' has gone from being something to laugh at to something to fear. Five or six blacks (or occasionally Mexicans, Asians or even white trash) with guns will jump a rival gang member, someone they have beef with, or even a random person, usually in a dark alley or parking lot, shout "flash mob!" and just open fire. A flash mob could also be a drive-by shooting where there are several shooters.
"Flash mob, nigga!" (blast BLAST boom boom POW)
by LL Jonez December 7, 2012
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flash blood

The act of sharing ones blood while high on heroin with another to get them high. If one junkie has used and the other has no heroin, the one who is high will draw their blood into a syringe and inject the non-holding junkie with the blood to get them high. A new practice that will spark the spread of aids and hepatitis like wildfire.
Mambasa, flash blood me, I aint holding and am getting dope sick.
by biffula July 13, 2010
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