so-and-so
nounmasculinecoloquial/fuˈlɐ̃nu/medium
fu·la·no
Definition
A generic name for a person, used when one does not want or cannot specify the name.
So-and-so said he would come to the party.
I don't know where that so-and-so is.
Etymology
De origem incerta, possivelmente do árabe 'fulān'