Definitions by Roberta Hackett

pop the bean 

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!

pop the bean by Roberta Hackett May 12, 2006