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hiking the appalachian trail 

Refers to someone's infidelity
"Did you hear about Mark's divorce? He was caught hiking the Appalachian trail."

I was hiking the Appalachian Trail. 

Made famous by South Carolina Governor Mark Sanford, it's a euphemism for when you're doing something nefarious.
Randy: Hey, were you out messin' around with that tranny again?

Daryl: Nah, dude. I was hiking the Appalachian Trail.

Hiking the Appalachian Trail 

Making a long-distance clandestine trip for purpose of an extramarital affair
If you can't find me next week, I"ll be hiking the Appalachian Trail.

hiking the Appalachian 

"So, how did your date go last night? You hike the Appalachian?" or "I'm sorry, the Governor is not available. He's out hiking the Appalachian."

Hiking the Appalachian Trail 

A poorly executed secret tryst - that isn't a secret to anyone.

It is a reference to the disappearance of South Carolina Governor Mark Sanford who "disappeared" for a week to Argentine on a romantic escapade. His staff and office told the news media that he was "hiking the Appalachian trail."
Dave needs to take a break from hiking the Appalachian trail with his secretary and get some work done!

Hiking the Appalachian Trail 

Going AWOL on your job to have a clandestine affair.
"Where has Joe been for the last three days? He didn't tell us that he'll be taking time off!"

"Uh... He's hiking the Appalachian Trail."

"Oh. In that case, where's the pink slip?"