any creepy-crawly bug or worm; any disgusting insect or reptile (see Molina)
Alonso de Molina:
yoyoli. qualquier sabandija. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 39v. col. 1. Thanks to Joe Campbell for providing the transcription.