to do something poorly or with malice -- from a- (not) cualli (good) and tlachihua (to do or make something) (see Molina)
Orthographic Variants:
aquallachiua, aquallachihua
Alonso de Molina:
aquallachiua. n. (pret. onaquallachiuh.) hazer alguna cosa mala. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 7r. col. 1. Thanks to Joe Campbell for providing the transcription.