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Refers to someone's infidelity
"Did you hear about Mark's divorce? He was caught hiking the Appalachian trail."
by dcwedge June 26, 2009
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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.
by Butler CW June 24, 2009
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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.
by radgtr June 25, 2009
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a word used to describe someone who cheats but tries to cover it up.
You: Hey did you hear about that governor from South Carolina?

Friend: No, what happened?

You: He got caught "walking the appalachian trail" with a chick from Argentina.

Friend: Oh snap.
by campbelluniversity June 24, 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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Cheating on your wife or girlfriend, especially if in the process of cheating, you disappear for a few days and say you are going someplace where it is impossible to be reached. Can also be used on a woman to say that she's cheating.

Same meaning as the other two entries here at UrbanDictionary.com: "Hiking in Appalachia" and "Hiking in the Appalachian Mountains", except that that "hikin' the Appalachian Trial" sounds better.
guy 1: "Where's Dave? I thought he he was going to play golf with us today."

guy 2: "He told his wife he had to work the weekend, but I think he's hikin' the appalachian trail. He was flirting all week with that new chick in accounting"

-or-

guy 1: "Where has your girlfriend been lately?"
guy 2: "I dumped her ass! Caught her hikin' the appalachian trail, and that was it for that slut!"
by rpompeii June 29, 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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