a very full measuring device, overflowing (see Molina)
IPAspelling:
tɬɑpepeʃoːniːlli
Alonso de Molina:
tlapepexonilli. medida bien llena, desta manera. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 131v. col. 1. Thanks to Joe Campbell for providing the transcription.