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The act in which two men slide their penis' along each others shaft in a back and forth motion.

This is similar to the naval act in which two warships would sail beside each other in order to exchange fire.
"I heard that Jim was getting dirty with another guy!"

"Really? Sex?"

"No, they were just broadsiding a bit."
by Super Duper Pooper Scooper June 18, 2013
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