A greasy spoon is a small, cheap eatery – either an American diner or coffee shop, or a British cafe – typically specializing in fried foods and/or home-cooked meals. The term "greasy spoon" has been used in the United States since at least the 1920s; and is sometimes used in the United Kingdom to refer to a cafe or caff, which is not to be confused with the European term café which may mean coffeehouse or bar. According to the Oxford English Dictionary, the term "greasy spoon" originated in the United States and is now used in various English-speaking countries.
The earliest appearance of the term in print (MacMillan's Magazine, 1906), refers to events of an earlier time: a restaurant in Paris was visited daily by Robert Louis Stevenson in 1874. "...the Cremerie in the Rue Delambre, - an eating-house much frequented by artists, and familiarly known as the as The Greasy Spoon..."
Nicknaming cheap fried food restaurants after an unwashed spoon dates back at least to 1848: "The Gabbione [in Rome]... has withal an appearance so murky and so very far removed from cleanliness, that the Germans have bestowed upon it the apellation of the 'Dirty Spoon'."
Many typical American and Canadian greasy spoon diners focus on fried or grilled food, such as Salisbury steak, fish and chips, deep fried chicken, sausages, bacon, waffles, pancakes, fried or scrambled eggs, and omelettes. Sandwiches are also popular, including hamburgers, steak sandwiches, and deli meats. These are often accompanied by sides of baked beans, hash browns, toast, french fries, coleslaw. Soups and chili con carne are generally available. Regional fare is often served. Since the 1970s, many Greek immigrants have entered the business. As a result, native Greek cuisine such as gyro and souvlaki meats are now a common part of the repertoire, often served as a side dish with breakfast and as a replacement for bacon or sausage. Coffee, iced tea, and soft drinks are the typical beverages, as alcohol is usually not offered due to the prohibitive cost of a liquor license. Pie and savouries and ice cream are popular snacks and desserts.
A greasy spoon diner is often located alongside a main road to serve passing motorists, particularly a truck stop catering particularly to truck (lorry) drivers, this is known as a transport cafe in Britain.
Although there are now far fewer establishments due to the dominance of corporate fast food restaurant chains, the greasy spoon diner is still nostalgic thanks to "counter service, jukeboxes and hearty comfort cuisine". The greasy spoon is a common setting in fictional movies and TV shows.  
- dictionary.com Greasy spoon
- Duncan Smith (13 February 2015). "Cafe culture: The survival of the traditional British 'caff'". bbc.co.uk.
- "Greasy". Online Etymology Dictionary. Retrieved 7 April 2012.
- "greasy spoon" entry, OED