to walk quickly; or, to run along on tip toes (see Molina)
Alonso de Molina:
quetzilpaina. ni. (pret. oniquetzilpain.) andar apriesa, o correr sobre las puntas delos pies. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 89r. col. 2. Thanks to Joe Campbell for providing the transcription.