'Kumbaya' is a pejorative slang term which can be used as a noun or an adjective.
Noun:
A person, usually in the West today, who shallowly and superficially cites a multitude of creeds or religions, usually Buddhism and
Christianity, then pretends to be a spiritual guru and role model.
Adjective:
A term used to describe something or an action as spiritually ignorant, and
superficial and shallow.
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Term based off of the song 'Kumbaya', from 1957, which was 'borrowed' from Southern,
African American song 'Come By Here' from 1927.