noun. A man's man, full of beef and testicularity and dumbassitude. A loincloth may be present.
Real citation: "Commentator during women's ice hockey:"This is the women's event;there's not s'posed to be much violence."Excuse you?! Bite me,testosto-boy!"
(Feb. 15, 2010, Alex Sims, Twitter, http://twitter.com/AlextheFly/statuses/9162432503)
Made-up citation: "It's hard for a testosto-boy like me to date. I intimidate everyone with my muscles, my musk, and my moat. Plus, it's expensive hiring servants to pull the ball cart that supports my notorious nads."