noun
country bumpkin visiting the city; out-of-towner; yokel
A mildly mocking or affectionate term used by city dwellers for someone from the countryside who is visiting the big city and may seem unsophisticated or overly excited. Often used in a teasing, lighthearted way rather than as a harsh insult.
東京に来たおのぼりさんが、電車の乗り方に戸惑っていた。
The out-of-towner who came to Tokyo was confused about how to take the train.
彼はおのぼりさん扱いされるのが嫌で、必死に東京の地理を覚えた。
He hated being treated like a country bumpkin, so he desperately learned the geography of Tokyo.