MOCHAHCHAMĀHUANI someone arrogant and self-important / el que se jacta y alaba (M), arrogante, orgulloso (T) [|i)Tp.148j. This is specifically non-first person. Presumably it could also take first person prefixes. See CHAMĀHU(A).
Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 150.