Code for cheating on your spouse, significant other.
"If anyone needs me, I'll be hiking the Appalachians." -Gov. Mark Sanford

Guy 1: Dude, where were you Saturday night? I thought I'd see you at the club with your girl.
Guy 2: Nah, man, I was hiking the Appalachians.
by Bert-Bert June 24, 2009
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"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."
by Call Me Mr. Gee June 24, 2009
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In June, 2009, South Carolina governor Mark Sanford disappeared from public sight for five days, a period during which neither his wife nor much of his staff apparently knew where he had gone. A Sanford spokesperson eventually told reporters that the Governor was on a secretive hike along the Appalachian Trial to clear his head after a tough legislative session. Turns out that Sanford had actually been in Argentina where he had been conducting an extra-marital affair.
"Why is Bob's wife angry with him?"

"He got caught hiking the Appalachian, if you know what I mean."
by bobjones55 June 24, 2009
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Code for having an affair.

In the case of a Republican, more often than not it'll be a same-sex affair.
I hold a high-stress political job and my wife refuses to give head. I guess I'll have to go hiking the Appalachian when the current legislative session is over.
by Dr. Zoid Johnberg June 24, 2009
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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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