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Communitywashing is a term that describes a person, place, or thing that claims to support a community or cause, but in reality does not.

Communitywashing is in the same family of armchair activists, greenwashing, or pinkwashing.
P1: "Gary always says he supports (community event, cause, or point of pride), but I've never seen him there, have you?"
P2: "No way, he's totally communitywashing."
P1: "What a slacktivist."
by WTFMarketing April 10, 2013