Ernie Stautner, a Dallas Cowboys assistant coach, offered this definition of the mean streak in 1979 as an explanation of Randy "The Manster" White's brilliance: Say two boxers get together and want to spar. They both agree they won't hit each other. But then they start sparring and one guy sees an opening. Pow, he hits you with everything he's got. That's a mean streak [To me, it's good to have a mean streak during a triathlon - swim excluded].