-yoma.

Headword: 
-yoma.
Principal English Translation: 

in person; also: spontaneously, especially in 3rd person

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), 242.

Lockhart’s Nahuatl as Written: 

possessed form behaving much like a relational word. probably related to iyoh alone. The grammars speak of -nohmah with identical structure and meaning, but -yohmah is seen more in actual texts.
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), 242.