What is slippin the surly's?

Answer 1

Flying. It comes from the poem by John McGee below:

"High Flight"

Oh! I have slipped the surly bonds of Earth

And danced the skies on laughter-silvered wings;

Sunward I've climbed, and joined the tumbling mirth

of sun-split clouds, - and done a hundred things

You have not dreamed of - wheeled and soared and swung

High in the sunlit silence. Hov'ring there,

I've chased the shouting wind along, and flung

My eager craft through footless halls of air....

Up, up the long, delirious, burning blue

I've topped the wind-swept heights with easy grace.

Where never lark, or even eagle flew -

And, while with silent lifting mind I have trod

The high untrespassed sanctity of space,

- Put out my hand, and touched the face of God.