Plural of muchacho; Spanish word for boys or young men, sometimes used in English to refer to a group of guys or friends.
From Spanish 'muchacho' (boy), of uncertain origin but possibly related to Basque 'motxo.' The plural form 'muchachos' entered English slang through cultural contact, especially from the American Southwest and in pop culture.
The word 'muchacho' became cool in English through cowboy culture and later through music and film—it has a friendly, informal vibe that made it jump from Spanish into English. You'll hear it more in pop culture than in actual formal Spanish.
Muchacho defaults masculine plural in Spanish; muchacha (feminine) exists but muchachos often used generically for mixed groups, rendering girls/women invisible in collective nouns.
For mixed groups: use muchachas y muchachos, or chicos (more gender-neutral), or jóvenes (youth). Be explicit when including girls.
["jóvenes","chicos","muchachas y muchachos","youth"]
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