This is the 6906th most frequent Spanish word.
diablo
Devil.
The word "diablo" is used here in its primary meaning, referring to the devil or a mythological figure representing evil.
El diablo es una figura recurrente en muchas historias y leyendas.
The devil is a recurring figure in many stories and legends.
Here, "diablo" is used idiomatically in an exclamation to express surprise or disbelief.
¡Qué diablo estás haciendo?
What on earth are you doing?
In this sentence, "diablo" metaphorically describes something very fast or intense, in this case, a fast-moving car.