ciuayo. persona que se sirue de mugeres. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 22v. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
–CIHUĀYŌ. S gives this with a double vowel medially and an absolutive suffix and analyzes it as a compound of CIHUĀ–TL and ĀYŌ–TL. But C has this in a section with –OQUICHYŌ, 'semen,' both apparently inalienably possessed forms of the corresponding nouns, although it is not impossible that –YOH is intended. M also has cihuayotl, 'vulva.'