A dogwhistle used by the right wing community. "yuo" is just a mispelling of "you" it doesn't have any hidden meaning, it's just a misspelling used by right wingers (or sometimes not only right wingers, just people interested in politics) to recognize each other.
person 1: Hey, how are yuo doing?
person 2: Heyyy.... waittt.... is that a dogwhistle!?!?
Phrase said by Brazilians when yuo going to Brazil. Please, Don't try this at home, most people don't survive after this, because of that, we don't know how is Brazil.