A phrase originally used in the late '60s and early '70s in support of the hippie movement against the older generation's often prude and narrowminded world view, which associated long hair (especially on males) with a sloppy lifestyle. Sometimes also related to long hair on males being associated with homosexuality due to the similarity with traditionally feminine hairstyles. The phrase emphasizes that the speaker isn't affected by what is meant as an insult but actually embraces the accusation.
"Get a haircut, you hippie!"
- "Long hair don't care!"
or:
"Get a haircut, you faggot!"
- "Long hair don't care!"
Lil Wayne often uses this in his lyrics. He is saying he doesn't care if a girl, chick, woman, whoever has a "bush" or long pubic hairs. He will still fuck you.
A phrase total knobs or lame assnoobsuse to describe their freshly shorn locks usually while moronically gurning for selfies.
Natalia: Bin Bin, you toteel beech! You totally like ruined my new Louis Vuitton bag with your spice latte!!
Bin Bin: What evs... Short hair don't care.
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.