The idiom is no longer in widespread use, brought back into the common knowledge by the movie Tombstone.
It means something like “I’m your man” or “I’m the one you’re looking for” mostly utilized in response to someone else looking for help or workforce.
The idiom originates from the early 19th century, mostly used in the southern parts of the United States.
It is named after the American huckleberry, which is known for its small size. Many speculate that the berry is included in the phrase to refer to the triviality of the task at hand.
The name Huckleberry may also be familiar from the famous sidekick of Mark Twain’s Tom Sawyer, Huckleberry Finn, who also got his own book from the author.
The modern day upheaval of the expression comes from the 1993 film, Tombstone, where the character Doc Holiday says the mysterious yet well-known phrase, though at this context, it means “I’m ready to fight”.
It has puzzled watchers ever since, with loads of explanations found all over the internet. From the first entry on Urban Dictionary in 2004 to videos and articles, many people have explained the true sense behind the famous phrase.