a small quantity of a beverage, a sip (?) (see Molina)
Alonso de Molina:
centlaltequiliztli. vn soruo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 18r. col. 1. Thanks to Joe Campbell for providing the transcription.