Green’s Dictionary of Slang

jingleberry n.

[var. on dingleberry n. (1)]

1. (US) in pl., a wealthy person.

[US]Hecht & Fowler Great Magoo 167: Some jingleberries she married is backing her.

2. (US) a testicle.

[US]Randolph & Wilson Down in the Holler 103: Some girls don’t like sassafras, / They all like jingle-berries bouncin’ on their ass.
[US]Randolph & Legman Ozark Folksongs and Folklore I 555: jingleberry, testicle.

In compounds

jingleberry tea (n.)

sexual intercourse.

[US] in Randolph & Legman Ozark Folksongs and Folklore (1992) I 555: The first one he courted / Was a purty gal to see, / Set right down to jingleberry tea!
[US]Randolph & Wilson Down in the Holler 103: Smart old woman says to me, / All she needs is jingleberry-tea.
[US]Randolph & Legman Ozark Folksongs and Folklore I 555: jingleberry tea, sexual intercourse, from jingleberry, testicle.