something big or enlarged or something full like thick wool (see Molina)
IPAspelling:
tʃɑmɑktik
Alonso de Molina:
chamactic. cosa gorda y crecida, o cosa basta como lana gruessa. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 19r. col. 1. Thanks to Joe Campbell for providing the transcription.