Principal English Translation: 

it serves someone right

Frances Karttunen: 

-TEPAHYŌ necessarily possessed form it serves one right (expression of satisfaction in just punishment] / cuando uno se huelga del mal de otro, o muestra que tiene u merecido (C), tanto mejor, bien hecho (S) [(7)Cf.122r,125r,125V,131v].
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 228.

Horacio Carochi / English: 

-tapàyo = it serves someone right
Horacio Carochi, S.J., Grammar of the Mexican language with an explanation of its adverbs (1645), translated and edited with commentary by James Lockhart, UCLA Latin American Studies Volume 89 (Stanford: Stanford University Press, UCLA Latin American Center Publications, 2001), 512.