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4.
when a male crams his balls through the fly of his pants and unsupectedly shows a female or male for that matter.
Yo that girl sucked the knowledge out of my cat brains.
by ms.kittey June 10, 2006
 
1.
to ask a group of buddies if they have ever seen cat brains, when answered with a no proceed to whip out sack and say look, when they turn around yell cat brains!

southern version of the sack attack!
carl: hey guys ever seen some cat brains?

guys: Hell no, thats sick!

Carl: look, (pause) Cat brains bitches!!!
by jimmy haynes January 30, 2008
 
2.
holding your nuts in such a way they resemble a small set of animals brains, like a cat
We were watching some wrestling when Jeb jumped out sportin catbrains.
by H8tank June 14, 2003
 
3.
1. The showing of one's scrotum bunched up in one hand tightly so it resembles cat brains. Usually used to make someone look so you can then call them "gay" and a "fag" and with good reason.
Brian: Hey colin look at this
Colin: What
*Brian whips out the cat brains
Colin: WTF thats nasty
Brian: OMG you looked what a FAG!
by Kirk Johnson November 26, 2005
 
5.
The brains of a cat. usually dead, but there are exceptions to this rule.
Steve: You know whats good on toast?
Jim: Cat brains?
by Jimfaaace November 05, 2006