Dang, that was obscure enough I had to look it up...
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"A man; specif., the exact kind of man needed for a particular purpose. 1936: "Well, I'm your huckleberry, Mr. Haney." Tully, "Bruiser," 37. Since 1880, archaic.
The "Historical Dictionary of American Slang" which is a multivolume work, has about a third of a column of citations documenting this meaning all through the latter 19th century.
So "I'm your huckleberry" means "I'm just the man you're looking for!"
"I'm your huckleberry..." Val Kilmer as Doc Holliday in Tombstone.
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Didn't think until now I'd ever miss Star Trek references so much.
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Would it be better if I had said "I'll be the Gorn to your Kirk."?