In Sting's song Englishman in New York he refers to the term "Legal Alien", what is a "Legal Alien"?
Being a legal alien means you are allowed to be somewhere, but don't really fit in. Sting has the perfect example: The Englishman in New York.
A typical Englishman, distinquished, high esteem, upper class, can feel quite out of place when positioned in New York, which is high speed, high energy, fast, and a bit brutal.
The formal definition of a legal alien is:
"An alien who is legally permitted to remain in a country which is foreign to him or her. On specified terms, this kind of alien may be called a legal alien of that country."