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A competitive sport in which you bend over, cupping one hand over your balls and then attempt to punch your opponent's balls till they submit. Typically there are no real rules and is usually the result of long night of drinking.
Husband - "I'm not sure if we will ever be able to have kids. When I was in college I was a professional ball boxer and now my sperm are punch drunk."

Wife - "What is ball boxing?"

Husband - "It's really not a clever name. We would get drunk, cup our balls and proceed to punch each other till someone gave up. Did I mention we were drunk?"

Wife - "Why in god's name did I ever marry you?"
by GroovySan January 01, 2008
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