Uncommon usage, technical jargon, verb, meaning 'to erase'.

Comes from 'eeproms' (Electrically Eraseable Programmable Read Only Memory) units in days of yore which were 'flashed' so they could be written on again. Typically, a computer geek would understand this usage.
PC Onwer: "So, should I through my broken computer in the trash?"

Technician: "Make sure you flash the drive first, for security reasons."

PC Onwer: "WTF?"

Tech: "Uhh...erase all the information."
by T.R.I. July 24, 2006

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An application that can be used to create amazing content, but instead is often used to create crappy porn slide shows or dress up "games" that are then submitted to Newgrounds, and recieve high ratings.
Man1: "Hey, look at this guys experimental Flash site!"
Man2: "Nah, newgr0undz hazzz b00b13z."
Man1: "but..."
Man2: "B00BI3ZZZZZZ!!!!!111111one!!!111one"
by 8bit April 27, 2006

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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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The feeling of beeing stoned.
Can be used as noun or adjective.
Man, I'm having a flash....

I feel the flash.....

I feel flashed.....
by HuMaNbEiNg June 18, 2005

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a south london MC,MC Flash,hes a quick as a flash an is 1 of da sickest MCs about hes on da pirate radio station Delight.FM
raah!mc flash cum down last nite an ripped it up bruv!
by Sam August 01, 2004

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fast and furious
Lightningfast man
by flash December 16, 2003

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When you bone a chick in under 2 minutes.
Damn Jeff couldn't stay with Melissa for more than 2 minutes...
by The Big Man! September 22, 2003

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To almost black out while going off on someone.

To Snap.
Chic 1: Girl, me and Johnny got into yesterday.
Chic 2: Whaaat...again? What happened girl?
Chic 1: Girl, I found out he's been creeping on the low and honey...I just flashed on him.
by Miss Smith87 January 17, 2017

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