molhui.

an intensifier; this is a puzzling form, according to Lockhart, perhaps related to Molina's molhuia (apparently mo-(i)lhuia) for something to increase, grow.
James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 225.