Well, technically it isnt referring to the race of Men, as Eowyn could kill him.
And Hobbits have been said to be a deriviation of the race of Men. They are just shorter. Technically the Easterlings arent Men, as they are of the race of Easterlings/Haradrim. Therefore, we must say that it IS whats between your legs, along with your race, or some other needlessly complicated thing.
Again, unless Chief has to resort to punching and kicking, Chief wins. If WK takes out the energy sword, he wins.