ompa onquiza. persona muy pobre y necessitada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 76v. col. 2. Thanks to Joe Campbell for providing the transcription.
Attestations from sources in English:
ompa onquiza = he's going out for there ('emerging there from here')