momolotza.

Headword: 
momolotza.
Principal English Translation: 

to mix something with air (see Molina and Karttunen)

IPAspelling: 
momolotsɑ
Alonso de Molina: 

momolotza. nitla. (pret. onitlamomolotz) hazer espuma enel agua, meneandola.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 059r. col. 1. Thanks to Joe Campbell for providing the transcription.

Frances Karttunen: 

MOMOLOTZ(A) vt to mix something with air / hacer espuma en el agua, meneándola (M), levantar ... polvo (C) [(1)Cf.74VJ. See MOLŌN(l).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 152.

Attestations from sources in English: 

momolotza (verb) = to cause to foam, to cut to pieces
Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1877), 158.