When you go to a club, get drunk, and leave with a woman, not knowing she is hideous. You then return to her apartment, and you sober up before you are about to have sex. Though you realize she is unattractive, you still fuck her. You then proceed to bust your nut quickly, somewhere between five or ten minutes. Once you nut, you immediately pull out, grab your clothes, and bolt out of her house. Just as The Flash would do.
Dude 1: "Bro what happened to you last night? You left with some ugly chick."

Dude 2: "I know man. Lets just say i was The Flash last night. I got to her house at around 1:00 and was home at 1:09."
by DNKenij March 30, 2009
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1. to erupt in physical violence against another which is out of control and fierce.
2. to suddenly become outrageously profound and irate in an arguement which causes the other person to react in either submission or escalation.
3. an old game where a kid gets to slap the back of a hand of another kid who has accidentally just said a word that they didn't mean to say.
We were all just chill'n and then all of a sudden these girls got to flash'n at the bar.

2.Jimmy- "Hey Timmy, did you see that cock? (laughs)...I mean cop!"
Timmy- "Alright there Jimmy, let me get my flash" *slap*
by sancho82 January 4, 2009
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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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a jerk or some one who is very mean towards others; a bottle
He was being such a flashe to the poor girl so she slapped his sorry face.
I drink my sprite from a flashe/
by charchar June 25, 2006
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When you happy for 1 second, then get mad and wanna fight
"aye bruh, becareful so i dont flash on you".
by uhnonymis August 30, 2017
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looking extremely good or well dressed, equivalent to bawlin or pimpin
"nothins safe not your tv, or dvd. no one can read me my rights, flee the scene lookin flash on your brand new bike" --Drapht
by Telephone45 August 24, 2007
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to suddenly go from a fine demeanor to an aggressive/hostile one
i was jus sittin here, mindin my bidniss, and you went on flash for no reason.
by skilldoo February 20, 2008
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