Top Definition
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.
por Joe W. 10 de Outubro de 2004

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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.
por Crabkilla2001 16 de Janeiro de 2009

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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!!!"
por the killa 25 de Outubro de 2003

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Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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