1. A person who is impulsive and likely to act on a whim. Generally these impulses are quick (happen in a flash) and are detrimental to those involved (fuck people over)

2. A short tempered young-man with a penchant for unreasoning, undeserved, and altogether senseless violence.
1. Johnny could never be a cop; that flash fucker would fill body bags faster than a russian racehorse fills a shotglass with piss.

2. Don't fuck with Johnny over there. Sure he's little, but he's a real flash fucker. He tore some kid's ear off for looking at his hand.
by JDrake April 12, 2009
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A person who practices flash fucking.
I've been a flash fucker ever since that night at the swinger club when I participated in an orgy.
by Emmanuelle Undine November 28, 2010
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