black-ccent
n.— «With his light skin, African father and white mother, and only faint hint of what I call a “black-ccent”—the subtle vocal quality that makes most black Americans identifiable as black over the phone (yes, one can “sound black.” It’s been demonstrated repeatedly by linguistic analysis, and the “black-ccent” overlaps only partially with white Southern)—Mr. Obama would easily be cast by these types as “not too black.”» —“The Color of His Skin” by John McWhorter The Sun (New York City) Sept. 21, 2006. (source: Double-Tongued Dictionary)