something thickened, sticky (see Molina); may be a type of glue
Alonso de Molina:
tlatetzauhtli. cosa espessada, o quajada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 136r. col. 2. Thanks to Joe Campbell for providing the transcription.