Definitions by RibBreaker

Break a rib 

The act of jerking off in the shower with no regard to the risk of falling and breaking one's rib.

Dude- Did you hear about Dave? He slipped in the shower when he was jerking off.
Did he break a rib?
Yes and he finished the job even though he was in intense pain.

Break a rib by RibBreaker March 2, 2011