While not a common girl name it is typically used in Northern California to describe Southern California girls named Denice typically from San Diego
as being uptight or mean. The term has been used by countless underground bay artists and was originated in Berkeley California.
Man: Damn girl can a niggah get yo name and number?
Denice: The name is Denice and no you can't get my number!
Man: Fuck you then girl I thought you was Denice not DeMean!
Friend 1: Damn i wonder who that girl is
Friend 2: Don't fuck with her blood she from Diego, not tryna fuck with real niggahs.
Friend 1: Damn bruh shoulda just told me she was DeMean.