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1.
Kumbayah is a uniquely African-American contribution to American English.

Kumbayah is a Gullah pronunciation of the phrase "Come by here" (or "come by yah", 'yah' being a West African form of 'here'.)

This word has been turned into an ironic term by overusage and misinterpretation by the mainstream culture. However, it's actually a call to God to visit the singer. "Kumbayah my lord" means 'come by here, my lord".
"Kumbayah my lord"
"Let's all join hands and sing Kumbayah."
by Adisa September 20, 2007