the folding or the thick lips of the genitals of a woman (see Molina)
Alonso de Molina:
picca. no. la plegadura o bezos dela natura dela muger. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 81v. col. 1. Thanks to Joe Campbell for providing the transcription.