you are... (e.g. toquichtli = you are a man); normally this would be ti-, but in some cases the "i" of "ti" is dropped, as here, in favor of the "o-" of oquichtli
(central Mexico, late sixteenth century; originally from Sahagún in 1574, a document that Chimalpahin copied)
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 2, 150–151.