"Hogeye" has developed several meanings since it first appeared. Early quotes:
Meaning 1
W. L. Rose, 1853, Hist. Slavery in N. Am. (referring to 1840s)
"Who's been here since I've been gone?
Pretty littl gal with a josie on.
Hogeye! Old Hogeye.
(Meaning unclear, although the rhyme has been preserved).

H. Nathan 'D. Emmett' 372, 1864
De (slave) trader rode upon a mule
The "hog-eye" kept his temper cool
He gib de word to go ahead
Den crack his whip an' say "nuff sed."

Meaning 2. California- A type of barge (now historical)
Whall, Sea Songs, 1870, p. 94"
"Oh, the hogeye men are all the go,
When they come down to San Francisco."

Meaning 3. The vulva or vagina. Discussed above.
Lomax, 1910(?) American Ballads 432:
"She could smile, she could chuckle,
She could roll her hog eye."

Quotes from J. E. Lighter, "Historical Dictionary of American Slang," vol. 2.
Meaning 4. The flower of the hog's eye plant. (OED).