Also means
mad
Usage Note
Loco can be purely clinical (mentally ill) or colloquially enthusiastic (estoy loco por el fútbol = 'I'm crazy about football'). Used as a noun, un loco / una loca means a madman/madwoman. In many Latin American countries it is also a very common term of address among friends, roughly equivalent to 'dude' or 'mate'.
Examples
"Está loco por esa cantante."
Natural Translation
He is crazy about that singer.

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