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1.
The vagina of a black woman
Bro, last night I got some dark meat and that big booty hoe had such a ripe jungle muffin I nearly barfed.
by Joey187 July 01, 2010
 
2.
A woman's breasts
It is commonly used in the abbreviated version, "J-Muffs."
Guy 1: "That girl has great Jungle Muffins."
Guy 2: "Yes, her breasts are exquisite, and prominently displayed."
by Andres 1 July 17, 2008