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"Huckleberry" was commonly used in the 1800's in conjunction with "persimmon" as a small unit of measure. "I'm a huckleberry over your persimmon" meant "I'm just a bit better than you." As a result, "huckleberry" came to denote idiomatically two things. First, it denoted a small unit of measure, a "tad," as it were, and a person who was a huckleberry could be a small, unimportant person--usually expressed ironically in mock self-depreciation. The second and more common usage came to mean, in the words of the "Dictionary of American Slang: Second Supplemented Edition" (Crowell, 1975):

"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
by kilo February 23, 2005
A gay cracker who provides sexual relief for straight brothers when their women arent around. Similar to 'strawberry' but without the drugs, and given by faggots.
- "I need to bus a nut b, but my girl aint around."
- "well Ramone got that huckleberry who pays to suck his dick - u can use him AND get some readies."
by shybutcurious January 11, 2014
A "disease" that is contracted by hooking up with a black man or woman
Yo did you know jessica hooked up with tyrone?

Yea that bitch got huckleberries
by Kenny Bartrum July 21, 2008
In Texas Hold 'Em, one who often catches the card that they need on the last card dropped (the River). If this happens often enough, they live on the "river," just like Huck Finn.
"Timmy, you %@#$! I can't believe you caught that ace on the river AGAIN. You're such a Huckleberry!
by Odin the Dog November 10, 2008
A fish or non-professional in a poker game.
The huckleberry in the three seat is down 3 g notes.
by Master Ro April 13, 2005
what once started as just a fuck buddy but turned into the best sex you ever had so he's/she's a keeper AKA huckleberry !!
i met up with a guy off the internet for sex but it turned out to be great SEX he's now my huckleberry !! I WANT TO MARRY HIM !!
by H2THEIZO August 21, 2009
Means a backwoods, six toed, inbred yankee who was denied admittance to the American south.
Stay upwind of the stinking huckleberry idiot(s) from New York.
by Zarkon September 09, 2010