a carelessness from someone that forgot something (see Molina)
IPAspelling:
neiːʃpololistɬi
Alonso de Molina:
neixpololiztli. desfrace, o descuido del que se olvida de algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 66v. col. 1. Thanks to Joe Campbell for providing the transcription.