for something to crumble, to fall apart, to fall to ruin (see Molina; based on desmoronarse algo)
IPAspelling:
kɑkɑjɑkɑ
Alonso de Molina:
cacayaca. (pret. ocacayacac.) desboronarse algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 10r. col. 2. Thanks to Joe Campbell for providing the transcription.