Any amazing, dangerous, incredible or violent act executed with relentless determination, aggression &/or precision.
Term originated in Columbus, OH by a local fight coach who practices & trains fighters/athletes. The term is meant to describe aggressive beast mode action while competing or performing.
Mike Tyson destroyed his opponent with savage finesse.
Special forces apprehended Osama Bin Laden with savage finesse.
Athletes who compete in X Games do so with savage finesse.