inside, or in the interior of a person, as in the abdomen (see other forms of teitic and teitec)
Alonso de Molina:
teitic. lo mesmo es que teitec. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 95r. col. 2. Thanks to Joe Campbell for providing the transcription.