literally, a bulging person (see Molina), but perhaps meaning someone with swelling?
Alonso de Molina:
timaltic. persona abultada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 113r. col. 2. Thanks to Joe Campbell for providing the transcription.