to have sex with another woman (woman to woman) (see Molina)
Orthographic Variants:
patlachuia
Alonso de Molina:
patlachuia. nite. (pret. onitepatlachui.) hazerlo vna muger a otra. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 80r. col. 2. Thanks to Joe Campbell for providing the transcription.