Sneak away to meet your mistress. ("Hiking the Appalachian Trail" is the first explanation of where South Carolina Gov. Mark Sanford was when he disappeared.)
"Has anyone seen Jawann? I've been calling and texting him for three days and he's not answering."

"Uh, he's hiking the Appalachian Trail."

"Oh. Got it."
by Frankie Fiveangels June 26, 2009
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To be unfaithful to one's partner e.g. in an extramarital affair. Named after South Carolina Governor Mark Sanford, who was said to be hiking the Appalachian Trail, when actually he was visiting his mistress in Argentina.
"My husband has a lot of "meetings" and "conferences" to attend to lately. I think he might be hiking the Appalachian trail."
by wordanista July 5, 2009
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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!
by Walking Stick June 24, 2009
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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?"
by L-R- July 17, 2009
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An unnecessarily bizarre and implausible cover story for marital infidelity.
I'm sorry, Carol, I can't go to your mother-in-law's Tupperware party this evening. I'm hiking the Appalachian Trail with that new secretary from the office... in Argentina.
by Abolish the Fed June 24, 2009
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A euphemism for a mysterious disappearance as a result of illicit activities.
Disappear for a few days and need an explanation? "Sweetie, I was just 'hiking the Appalachian Trail!'"

Boss asking for a note on why you were out for a four-hour lunch with his wife? Yep, you guess it - you were out hiking the Appalachian Trail!

See also Sanford, soon-to-be-former Governor of SC.
by thecovert June 25, 2009
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