Older Slang: Disparaging.
[ ping-koh ]
/ ˈpɪŋ koʊ /
noun, plural pink·os, pink·oes.
a person with left-wing, but not extreme, political opinions.
a person who leans toward communist ideology.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for pinko
/ (ˈpɪŋkəʊ) /
noun plural -os or -oes mainly US derogatory
a person regarded as mildly left-wing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for pinko
1936, derogatory slang form of pink (n.), used of people whose social or political views "have a tendency toward 'red;' " a metaphor that had existed since at least 1837. As an adjective by 1957.
Online Etymology Dictionary, © 2010 Douglas Harper