Also means
haha
Usage Note
Ja is the Spanish spelling of a laugh, equivalent to English 'ha'. It is typically repeated for sustained laughter: ja, ja, ja. In informal digital writing, jaja or jajaja is far more common than haha for representing laughter, and jejeje signals a more sly or subdued chuckle. The initial j is pronounced like English 'h'.
Examples
"Ja, eso no me lo creo."
Natural Translation
Ha, I don't believe that.

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