Green’s Dictionary of Slang

elderberry n.

[pun on SE elder and fruit n. (2)]

(gay) an ageing or old homosexual.

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[US]Maledicta III:2 222: Even the British [despise] everyone (as Auntie Mame put it) ‘somewhere between 40 and death’ as overripe fruit, elderberries, geriatricks (a UK term punning on US trick = short-time sex partner).