Flash is the act of expressing anger or annoyance by somewhat randomly snapping at someone.

Flash back is the act of flashing at a person who just flashed you.

Slang may have originated in Sacramento.
Person 1: Do you want to get pizza or tacos?
Person 2: . . .
Person 1: Do you want to get pizza or tacos?
Person 2: . . .
Person 1: Hellooooooo! Earth to Person 2! I said do you want to get pizza or tacos?
Person 2: Would you shut the f*** up? Can't you see I'm on the phone?!?!?! I couldn't care less about f***ing pizza or tacos. (flash)
Person 1: And I couldn't care less about you!! I'm out. (flash back)
by Alexa 3 October 29, 2006
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noun; a sudden reaction of intense nausea following the injection of a large dose of heroin.
Pancho: "You took too much, man!"
Pedro: "I'm gonna flash".
by xxyzzyx December 19, 2009
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When you have sexual intercourse with someone but you do it super fast
Wow Barry, you fornicate me as fast as the Flash
by SuperHeroFornicater November 25, 2016
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a sudden bout of rude or offensive conversation displayed by one individual in response to the other individual being a cunt bucket.
that bitch was gettin all up on my man last night, i had to flash on her.
by johnny freedom October 21, 2005
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To get 'flash/ed' is to get caught on a police speed camara.
Man slow the fuck down, babylon just flash you!
by Liquifux August 5, 2004
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A program created by Macromedia Inc. which allows the user to creat any number in a wide variety of on-line web based graphics and multi-media.

See: Strong Bad
The "Strong Bad's E-Mail" series is made with FLASH.
by Master Kiwi August 18, 2003
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To vomit at night after a bout of heavy drinking, so that one's vomit
sparkles from the streetlights as it hits the pavement.
"Man, I had to fucking flash on the way to my mother's house last night!"
by buffalo patty April 23, 2005
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