A phrase used to describe about a man/woman's hair getting long and doesn't care the fact that it is getting unusually long.
B-Money: Hey bro-sef, your hair is getting long. Why you ain't go to the Barbershop on Bundy Dr.?
J-Bone: Bro, long hair don't care. Besides I'm getting a perm at the salon next week.
Becky: Like oh my god Jessica, your hair is like so long now.
Jessica: Like yeah Becky, long hair don't care.