Noun
perfect stranger (plural perfect strangers)
A person with whom one has no affiliation whatsoever.
The man who passed me on the street was a perfect stranger to me. I have never seen him before.
Men always talk about the most important things to perfect strangers. In the perfect stranger we perceive man himself; the image of a God is not disguised by resemblances to an uncle or doubts of wisdom of a mustache. G. K. Chesterton
It's all right for a perfect stranger to kiss your hand as long as he's perfect. Mae West