A person whose skin color is so black
that they resemble a walking, talking (possibly soft-shoeing) piece of coal
. He/she could stand in front of a black-painted wall and do a cheshire cat
Yaphet Kotto: "My dear Wesley, you're looking quite black today."
Wesley Snipes: "Moi? Pish, tosh. You, my friend, are a block of solid carbon."
Sambo: "Y'all are coalies."