When the ball sack shrivels up and the dick hangs over it, leaving a protrusion from your pants, thus looking like a boner when indeed you do not have one. Usually ball boners make it seem like you have a small dick because of the unerected penis sitting on top of the ball sack.
After harry gets out of the pool, his ball boner revealed his dick to other girls who thought it was tiny.
by kevinaninno December 03, 2010

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