Lyric discussion by Wingdingo 

Cover art for Sec Walkin' lyrics by My Morning Jacket

Left leg. Right leg. One leg at a time I Keep on walkin. I keep on walkin. Red light. Green light. First Light I see tonight I'm walkin. Ooh yeah I'm walkin.

The speaker is walking. Walking one leg at a time. The red light/green light significance could be a red light being an obstacle/hardship, and a green light being movement forward and prosperity. No matter the "light" he will continue walking.

Fever! breathe in your own cool, blue air.

Perhaps, in times of hardship, or a big decision, tension rises (fever) and as advice says to take a deep, fresh breath of air.

Look for eyes that hypnotize and sparkle. Look for eyes that hypnotize and sparkle...everywhere. Brother, brother- don't you care? Brother, brother- don't you care?

While in his/your journey, look for the people who's eyes will captivate and amaze you. They are perhaps there to help you/be with you. In the case you are no listening/paying attention, the speaker calls you brother and asks you if you even care about his advice maybe...

Left leg. Right leg. One leg at a time I Keep on walkin. I keep on walkin. Red light. Green light. First Light I see tonight I'm walkin. Ooh yeah I'm walkin.

Same as before.

Fever! breathe in your own cool, blue air.

Also the same.

Demon eyes. demon eyes are watching. Demon eyes. demon eyes are watching...everywhere. Brother, brother- don't you care? Brother, brother- don't you care?

Like the phrase before that is very similar, the speaker is again giving advice. This time to watch for the demon eyes, the evils that will approach you. Again, as a friend/brother, do you even care about the speaker's advice/warnings.

In my opinion this is the second best song on the album right behind Thank you too! with Touch me I'm Going to Scream pt I & II tied for third. Anywho, that's what I think the song is about.