teixco teicpac nehua.

Headword: 
teixco teicpac nehua.
Principal English Translation: 

to upset someone by getting right in their face (see Molina, whose example here is in the first and second person; translation to English into the third person by Stephanie Wood)

Orthographic Variants: 
teixco teicpac neua
Alonso de Molina: 

teixco teicpac neua. (pret. teixco teicpac oneuac.) 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.