Green’s Dictionary of Slang

1. (US) beans.

1917

L.A. Times 22 Apr. III 22: Beans are apt to be called ‘bullets’ or ‘berries’ in the army, according to their condition.

2. the testicles [Williams notes a number of 17C sexual riddles in which a berry represents the penis].

1982		Maledicta VI 23: Testicles [...] berries.
2000		G. Pelecanos Shame the Devil 165: Sounds like someone’s pullin’ hard on that singer’s berries.
2011		J. MacArthur ‘Jack Rabbit Slim’s Cellar’ in Pulp Ink [ebook] [They] shot you in the ass and kicked you in the berries.

3. (US black) wine.

1980

E. Folb Runnin’ Down Some Lines 187: There are many vernacular terms for wine — the grapes, the berries, the vine [...] smash.

4. see berry n.¹ (3)