something squeezed, tight, woven closely (see Molina)
Alonso de Molina:
tlatzitzitztli. cosa recalcada, apretada y tupida. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 143r. col. 1. Thanks to Joe Campbell for providing the transcription.