Top definition
An act, usually public, in which a man hangs his scrotum out of the fly of his pants, pulls the skin tight around one testicle with his hand, and squeezes rhythmically, resulting in a veiny, throbbing effect reminiscent of a 1950s science-fiction monster.

Usually considered vulgar.
They're still talking about the time he walked into Denny's and flashed the hungry brain.
by Uncle Leon November 21, 2006
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