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A pair of testicles of such high testicular mass that it is made possible for the owner to sit down on them like a beanbag. This may be used figuratively to describe someone that is particularly daring or risk-taking, i.e. someone with balls of steel.
"Hey Mike, there are 5 of us, but only 4 chairs! What are we to do?"

"Worry not - Patrick has a Beanbag Ballsack, which he can use to sit on. There's even room for two!"
by russbag July 16, 2005
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