When you have a gameboy emulator on your flash drive and you plug it into a computer to play a game.
Josh "I finished my classwork early so I'm gonna be flashin' it over on the computer."
Brenden "Come get me when your Charmander is about to evolve."
by Kreeper George February 27, 2010
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Damn...that nigga was flashin when she spilled a drink on his shirt
by Cherry08 July 15, 2006
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angry, upset, not happy a bad situation
the boss got to work, and he was flashin cuz 3 people called in sick
by easy_t May 16, 2005
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Overreacting to criticism and extending your middle finger towards the crowd at a private school event of any kind

Publicly flipping off a large group of sheltered teenagers
Don't go flashin the ash in front of the Head of School
by BillOReillyGreatAmericanHero November 10, 2011
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Flashin is a verb used for the subconscious phenomenon that occurs when one is running past the opposite gender and, as a result, picks up their pace. While flashin is most commonly seen during the activities Cross Country and Track, people out around town are not safe from being flashed. While flashin is thought to be a primal instinct used to attract a mate, its origins remain largely mysterious.
*group of boys running past a group of girls*
Boy 1: Ay chill out man, you're straight flashin them hoes!
Boy 2: Oh my bad. I promise I can't control it.
by ScissorsTheMan February 28, 2023
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