This is the 12359th most frequent Spanish word.
loco
Crazy.
'Loco' is used here to mean 'crazy' in terms of intense enthusiasm or peculiar behavior.
Ese hombre está loco por bailar en la plaza todos los días.
That man is crazy for dancing in the square every day.
Here, 'loco' represents something unusual or extraordinary, possibly unreasonable.
La idea de viajar a la luna me parece algo loco.
The idea of traveling to the moon seems crazy to me.
'Loco' illustrates an unpredictable or erratic pattern, such as changes in weather.