"I Walk The Line"

Better Lyrics:

I keep my pants up with a piece of twine
I keep my fly wide open all the time
I keep the knot loose on my piece of twine
Say you'll be mine, and you can pull the twine

Original Lyrics:

I keep a close watch on this heart of mine
I keep my eyes wide open all the time
I keep the ends out for the tie that binds
Because you're mine, I walk the line

The way I recall hearing it:

I hold my pants up with a piece of twine
I keep my fly wide open all the time
I keep the knot loose on that piece of twine
If you'll be mine, then pull the twine

or

Say you'll be mine, come pull the twine

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The first two stanzas are on the net.