In the song Moon River what does your huckleberry friend mean?

In the song "Moon River," the phrase "my huckleberry friend" is a term of endearment referring to a close and trusted companion. The term "huckleberry" is often used colloquially to signify a person who is a perfect match or counterpart to oneself. Therefore, when the singer refers to someone as their "huckleberry friend," they are expressing a deep bond and connection with that individual.