to have a great fright or to wet oneself from fear
Alonso de Molina:
iuhquin cuitlatzayani noyollo. (pret. iuhquin ocnitlatzayan noyollo.) tener gran temor o mearse de miedo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 43v. col. 2. Thanks to Joe Campbell for providing the transcription.