(noun): a nickname used among friends referencing two inmates being on death row together. Implications of being called rowdog are that you have your friend's back, no matter what the cost.
A coworker says "Hey rowdog, I really need your help finishing this presentation."

Rowdog says, "Absolutely, I don't want you to have to turn in anything that's junky."

Coworker says, "Thank you rowdog. Nice work."
by Rowdog November 8, 2010
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Rowdogging is the practice of multiple people having anal sex with each other at the same time.
John, Joe, Jack and Jill all are rowdogging in the next room: John's banging Joe who's banging Jack who's banging Jill. Dirty!
by rock'n'roll November 4, 2007
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