charlie is often used as a reference to coke or cocaine. Hence songs like "take a wiff on me."
In the old blues and jugband that is used alot.

However i could be wrong and could be a different context. in the title of the song you have given could it not mean road... hence a well popular song title but could have been a slang   version.

i will keep my eyes open and see what i can find.

Regards.

Peter.