I liked his role so much that I wouldn’t even have cared, but the first time I had ever heard the word used other than to describe a plant, but I immediately intuited just what was meant in that context, and I loved it. I understand why for many, that is their favorite scene...:)
This ancient usage also pops up.
“The phrase has ties to Arthurian lore. A Knight, coming to the service of a damsel would lower his lance and receive a huckleberry garland from the lady ( or kingdom) he would be defending. Therefore, “I am your huckleberry” may well have been spoken to the Earps and the statement’s meaning may be “I am your champion”.”