1 definition by Robindaasian
When your ballsack is saggy and you stick it in her vagina when she's about to give birth so the baby starts kicking and punching at it like a punching bag from the uterus.
Right before my wife was about to give birth to my son, I performed the punching bag and he was already like manny pacquiao
by Robindaasian October 3, 2018