look up any word, like ratchet:
 
1.
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
 
2.
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