I frequently ask my wife What's up buttercup? In this instance, it is a term of endearment, like sweetie, honey, darlin', etc...and it is often used in place of these words. If someone said it in this context, that is probably all they meant by it.
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Lyndon City Hall. This is the official website of the City of Lyndon, Kansas. Lyndon is the county seat of Osage County. We are located on Highway 75 just 27 miles south of Topeka. Lyndon is situated between two Federal Reservoirs; Pomona Lake which is 5 miles north and Melvern Lake which is 5 miles south.