that which is greatly desired or needed; or, full of desire; or, the Sun, Lord of the Earth
Gran diccionario Náhuatl, citing Wimmer 2004 (who draws from Sahagún), "forme verbale, sur nehnequi, il est plein de désirs. / titre divin du Soleil, seigneur de la terre;" a verb form, from nehnequi, full of desire, or a divine title for the Sun, Lord of the Earth. (translation here by Stephanie Wood).