cuexpalli.

Headword: 
cuexpalli.
Principal English Translation: 

long hair that young men leave on the nape of their neck (see Molina and Sahagún)

IPAspelling: 
kweʃpɑlli
Alonso de Molina: 

cuexpalli. cabello largo que dexan alos muchachos enel cogote, quando los tresquilan.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 26v. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

y yamacuexpal = his paper locks on the nape of his neck
Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan, et al. (Norman: University of Oklahoma Press, 1997), 108.