When a dude stretches his scrotum tightly to one testicle and displays it. He could put it right next to a sleeping person's face, for instance. You could also just tightly wrap it to two testicles.
Dude, get your rat brain out of my face.
de Joe W. 10 octobre 2004

9 Words Related to Rat Brain

When a man squeezes his balls so that the scrotum bunches up slightly and takes on the appearance, shape, and texture of brains.
Carl pulled his balls out and showed everyone his rat brains.
de Crabkilla2001 16 janvier 2009
When wearing shorts you pull out one nut to show a suprised victim, thus ratbrain.
"Hey man wanna see a ratbrain?"
"Huh, a what...oh ewwww!!!"
de the killa 25 octobre 2003

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