Etymology
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pinko (n.)

1936, derogatory slang form of pink (adj.) in the political sense, used of people whose social or political views "have a tendency toward 'red;' " a metaphor that had existed at least since 1837. As an adjective by 1957.

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Definitions of pinko

pinko (n.)
a person with mildly leftist political views;
Synonyms: pink
From wordnet.princeton.edu