Besides the bovine definition, mavericks are defined as: an independent person who does not go along with current thinking or with the crowd.
And that's a good thing only if said maverick's thinking tends toward the sane.
Ozzy Osborne is a maverick.
Larry, Moe and Curly are mavericks based on the Merriam-Webster definition.
I'm sure you can think of plenty of folks who fit the description.
Just because you're a maverick doesn't mean you look like James Garner in his glorious youth or have a snappy theme song.