Principal English Translation: 

to mount/ride or hunt in various places

Alonso de Molina: 

aami. n. (pret. onaan.) motear o caçar en diuersas partes.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 1r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

aamini = that type of hunter
aamitinemi = to go along riding or hunting