any task, especially requiring physical strength and endurance, that is extremely diificult. Usually used by or applied to males
During SEAL training the five mile swim is a ball breaker for many recruits.

At the end of my six mile run when I got to the mountain I thought it would be a ball breaker.
by Canicum March 4, 2005
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a fat chick who roles onto your left nut while you're sleeping
That fucking bitch is a real ball breaker - all 500 pounds of her.
by Nick October 18, 2003
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a girl who is well known for hit guys in the testicles when she gets mad than do anything else like slap the face.
watch out Juile is a ball breaker
by sue October 19, 2003
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