Wrong again. Huckleberry Hound was a popular cartoon in the old west. It was a catchphrase from the show. Doc Holliday was a well-known fan of the series and had good comedic timing. It usually got a laugh to diffuse the situation right before he killed someone. Source is Snopes.Snopes also confirms, its "im your huckleberry" and "Ill be your huckleberry." I know snopes... But they have Val Kilmer himself confirming it, and the script..