1. Anything that is small, unimportant, or insignificant: In parts of the southern United States (Louisiana, Florida, etc.), during the early eighteen hundreds, the picayune was the name of an old French copper coin and the Spanish half-real; both of which were called picayunes.
2. An insignificant person or thing: In this part of Germany, people have been experiencing winter that is so mild that it is a picayune because it is more like spring than winter.