This is an expression, largely used in New York City, for baby boomer children of avowed American communists. It became the title of a one-man show in New York by Josh Kornbluth in 2000.
When the guy knew all the words to a Russian political song, I realized he must be a red diaper baby.
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Someone who was brought up in a liberal, leftist background
"...I knew Rorty a little; he was a shy and gentle man, a red-diaper baby who grew up to be a bird-watcher and a savorer of Proust and Kant in their original languages."
(from RICHARD RORTYβS PHILOSOPHICAL ARGUMENT FOR NATIONAL PRIDE by Stephen Metcalf)
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The children of leftist intellectual baby boomers, raised from birth on Marxism and a drug tolerant environment, and now in places of political and intellectual influence.
Red diaper doper baby politicians who want to legalize marijuana and tax the successful to support the unproductive.
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The ACLU (per Michael Savage)
They're a psychotic bunch of red-diaper-doper babies who were suckled on Karl Marx.
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