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This refers to an act performed on a male horse as part of groomming, when a lump of smegma that has built up under the foreskin and beneath the glans is popped out manually by the stallion's groom, vet or caretaker.
Hey Bobby!, give Secretariat a complete and thorough grooming today, and make sure you pop the bean on him!
by Roberta Hackett May 02, 2006
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