Could there be something over there? (an adverb) (see Molina)
Orthographic Variants:
cuix zazan tlein
Alonso de Molina:
cuix zazantlein. es quiza alguna cosa poray? aduerbio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 27v. col. 2. Thanks to Joe Campbell for providing the transcription.