something long, without measure or without end (see Molina)
Orthographic Variants:
aiuiayo
Alonso de Molina:
aiuiayo. cosa prolixa, sin medida ni termino. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 4r. col. 1. Thanks to Joe Campbell for providing the transcription.