1. To maintain a fragile balance between one extreme and another. i.e.: good and evil, sanity and insanity, decency and decadence, etc.
2. To behave; to abide by the the law and/or to abide by moral standards; to walk a straight path of decency by following the rules; to "walk the straight and narrow."

The latter definition is that applied in the song "Walk the Line" by Johnny Cash.

When you eat dirt for the first time and leave your family to build a shack in the woods

1. To maintain a fragile balance between one extreme and another. i.e.: good and evil, sanity and insanity, decency and decadence, etc.
2. To behave; to abide by the the law and/or to abide by moral standards; to walk a straight path of decency by following the rules; to "walk the straight and narrow."

The latter definition is that applied in the song "Walk the Line" by Johnny Cash.

1. The title of an awesome movie.
2. The title of an awesome song.
3. What it means is to walk the line when police are checking if you are sober. To be able to walk the line means you got your shit straight and not some bum that doesnt know what to do. To understand it better listen to the song or watch the movie.

The act of rubbing your penis against a girl's vagina, focusing on stimulating the clitoris. A complete fucking tease.