This is the 4221st most frequent Spanish word.
matador
A matador is a bullfighter who kills the bull in a bullfight.
Here, 'matador' refers to a bullfighter, specifically the one tasked with killing the bull in a bullfight.
El matador enfrentó al toro en la plaza.
The matador faced the bull in the arena.
In this context, 'matador' is used metaphorically to mean something exceptionally good or outstanding, colloquially referred to as 'killer' in English.
El disco matador se convirtió en el éxito del verano.
The killer record became the hit of the summer.
Here, 'matador' is employed as an adjective describing something lethal or deadly.