Stone Free

What is the meaning of Stone Free? It's a title of a song, but have no idea, what this means.

I am familiar with the song as sung by Mr. Jimi.

Meaning No. 2 (from Merriam-Webster). Completely free.

Main Entry: 4 stone
Function: adjective
1 : of, relating to, or made of stone
2 : ABSOLUTE, UTTER Pure stone craziness -- Edwin Shrake.

(Recorded by Jimi Hendrix.)

Every day in the week I'm in a different city
If I stay too long people try to pull me down
They talk about me like a dog
Talkin' about the clothes I wear
But they don't realise they're the ones who's square
Hey!
And that's why
You can't hold me down
I don't want to be down
I gotta move
Hey

Stone free - do what I please
Stone free - to ride the breeze
Stone free - I can't stay
I got to got to got to get away