Sorry guy, I didn't even have to Google that one because I know that movie so well. It really is... "I'll be your huckleberry", not huckle bearer.
I looked up the phrase just now and it actually existed and means I'll be your dance partner. Of course Holiday's implication meant "I'll fight (dance) with you".
"Are you just going to stand there and bleed?" Tombstone. Not an everyday saying, but a cool line.
I stand corrected. I went to the script on IMDB and it is huckleberry.