No, this has nothing to do with anyone's anus.
USANO: An acronym, usually derogatory, referring to the United States government, or to one of its citizens. Something like "gringo" but more specific.
USANO: An acronym meaning "USA No".
USANO: A United States citizen living in a Spanish-speaking, usually Latin American, country. This can be a basically neutral term useful only for informal identification in conversation. It can be used by the person or by others referring to the person. "Gringo" is about the same, but not identified with any particular country.