PDQ Food Stores was a chain of convenience stores located in the Wisconsin areas of Milwaukee and Madison, and one California store near Homewood. The chain began as Tri Dairy Store in 1948 in Middleton, Wisconsin, opened by Sam Jacobsen. Originally the store carried only dairy products, but Jacobsen added other grocery products as time went on, and business improved. The second store didn't come along until 1962; the name PDQ, an acronym for "pretty darn quick" or "pretty damn quick", was a popular catch phrase in the post-World War II era, and the name was suggested by Jacobsen's wife Mary. The original store soon adopted the name as well.