a glutton, someone who is not satisfied with what he or she eats
Orthographic Variants:
amo pachiuini
Alonso de Molina:
amo pachiuini. gloton, que no se satisfaze con quanto come. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 5v. col. 1. Thanks to Joe Campbell for providing the transcription.