a whistle formed from putting the hands on the mouth (see Molina)
IPAspelling:
mɑːtɬɑpiːtsɑlistɬi
Alonso de Molina:
matlapitzaliztli. silvo tal. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 53r. col. 2. Thanks to Joe Campbell for providing the transcription.