Top Definition
When your scrotum is tight and together, forming a "brain"- like figure.
Its cold out here", "Tell me about it, I have had brain balls since i walked out here
by TehBud April 17, 2011
1 more definition
a competition of kicking around novel ideas.
I had a good game of brain ball at the think tank today
by whoeverreally cares July 14, 2010

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