to open or break something (see Molina); seemingly can include the deflowering of a virgin
Alonso de Molina:
xapottimotlalia. abrirse o romperse algo assi. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 158v. col. 1. Thanks to Joe Campbell for providing the transcription.