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The process of placing one's testicles in the anal cavity of his partner.
This occurs after anal intercourse precisely at the moment you pull out. The anus will gape open just long enough to lower your testicals inside. If performed properly the anus will close with your testicals inside, and eureka you've performed the beansack
A male's scrotum sack (first widely used in scottish).
"Ach noi, I ripped me beansack"