the jowls of a person with a double chin (see Molina)
Alonso de Molina:
quech tlacxollotl. papo de persona papuda. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 88v. col. 1. Thanks to Joe Campbell for providing the transcription.