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Hikin' the Appalachian Trail 

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!"
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Hiking the Appalachian Trail 

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."

Hiking the Appalachian Trail 

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."

Hiking the appalachian trail 

Euphemism for preforming oral sex on a woman.

Specifically to lick from the bottom of a woman's labia upwards towards her clitoris.
Mark went 'Hiking the Appalachian Trail' much to the delight of his mistress.

Hiking the appalachian trail 

I was out "Hiking the appalachian trail"

hiking the Appalachian Trail 

Governor Sanford can't meet with you today; he's "hiking the Appalachian Trail."

hiking the appalachian trail 

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