missing the breast, or having the breast cut off, uncovered, or bare; can be said of a fowl (see Molina and dictionaries defining despechugar)
Alonso de Molina:
melpan petlauhqui. despechugado. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 55v. col. 1. Thanks to Joe Campbell for providing the transcription.