a rich and prosperous person, or someone noone knows
Alonso de Molina:
amiximati. persona prospera y rica, o el que no se conoce. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 5r. col. 1. Thanks to Joe Campbell for providing the transcription.