to be rude and disrespectful, to be in someone's face James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 221.
Alonso de Molina:
teixco teicpac ninemi. (pret. teixco teic pac oninen.) descomedirse con otro, yendosele ala cara. 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.