an affront, a lack of restraint, or being daring (see Molina; transl. to English here by SW)
Orthographic Variants:
teixco eualiztli
Alonso de Molina:
teixco eualiztli. acometimiento, descomedimiento, o atrevimiento. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 95v. col. 1. Thanks to Joe Campbell for providing the transcription.