Blacksea- used as a noun. defined as a certain type of style, a wavyness of someone's hair (usually having "black" colored hair). when someone says you have a "blacksea" they are saying that ur hair is wavy in a way that most people dont have, a unique wavyness.
Ex, noun: "Ay you know that dude Ray, dog he gotta Blacksea on his head, i wish i had hair like him..."
Ex2: "waves on my head are like a "blacksea" just flowing"