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27.
To have an extramarital affair in another country, especially South America.
South Carolina Governor Mark Sanford was hiking the Appalachian Trail last week and didn't tell anyone where he was, but he's really really sorry about it.
von Ken Starr 24. Juni 2009
 
1.
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.
von Sanford and Sin 25. Juni 2009
 
2.
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."
von Frankie Fiveangels 26. Juni 2009
 
3.
Refers to someone's infidelity
"Did you hear about Mark's divorce? He was caught hiking the Appalachian trail."
von dcwedge 26. Juni 2009
 
4.
v. To carry on an extramarital affair.
Governor Sanford can't meet with you today; he's "hiking the Appalachian Trail."
von SkidMarkyMark 25. Juni 2009
 
5.
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."
von wordanista 4. Juli 2009
 
6.
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.
von RadINTP 25. Juni 2009
 
7.
cheating on your spouse
I was out "Hiking the appalachian trail"
von Spartan1986 30. Juni 2009