In practice, a "best American" is anywo, worldwide, who lives in service to The People of his country, culture, or religion, in opposition to whatever forms evil takes in that country, culture, or religion.

On IDEAFARM.COM, those evil forms are called "the Establishment". Every country, culture, and religion has an "Establishment" that exists in opposition to the interests of The People generally, and to the ideals of that country, culture, or religion. If you stand with, and for, The People generally, and for those ideals, then you are a "best American" as the phrase is used on IDEAFARM.COM.