a person who lacks understanding, who is dull (see Molina)
Alonso de Molina:
yollo micqui. rudo de entendimiento, o boto de ingenio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 40v. col. 1. Thanks to Joe Campbell for providing the transcription.