a privy, a place for going to the bathroom, a toilet room (see Molina)
IPAspelling:
ɑːʃiːʃkɑlli
Alonso de Molina:
axixcalli. priuada, o las necessarias. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 10r. col. 2. Thanks to Joe Campbell for providing the transcription.