a country bumpkin/cousin
Someone from a rural area who is therefore not versed in city life or its social norms. Cousin Celia is such a country bumpkin. Last time, she took her shoes off in the middle of a restaurant! Can you dress a little nicer? You look like a country bumpkin in those overalls!
Someone unknowledgeable, unsophisticated, or naïve about the niceties and complexities of an urban environment, especially in a humorous or quaint capacity. I always try to lend a hand to the poor country cousins who invariably stand bewildered by the skyscrapers and the incredible noise of traffic. I thought I was savvy enough to live in New York City, but I soon felt like the country cousin.
One whose lack of sophistication or rural ways may amuse or embarrass city dwellers. For example, The sightseeing guide geared his tour toward country cousins who had never been to a large city before . This term, which literally means "a cousin who lives in the country," has been used in this figurative way since the second half of the 1700s, although the idea is much older (such persons were stock figures of fun in Restoration comedies of the late 1600s and early 1700s).