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This interjection is similar to the yahoo or yeehaw of the American cowboy during a hoedown, with added Ululation trills and onomatopoeia closer to "aaah" or "aaaayyyyeeee", that resemble a laugh while performing it.
The first sound is typically held as long as possible, leaving enough breath for a trailing set of trills.
Grito Mexicano has patriotic connotations
It's commonly done immediately prior to the popular Mexican war cry: "¡Viva Mexico, Señores!" (Long live Mexico!, Gentlemen!)
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