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2.
Where one says one is going when one is going to cheat on one's spouse.
Where's Mark going this weekend?

Appalachian Trail. At least that's what he told his wife.
by BeeDee04 June 30, 2009
 
1.
A euphemism for a long-distance bootycall to Argentina.

Additional points if you 1. are a politician 2. lie to an entire state/nation 3. Hail from South Carolina 4. Utter the words "I have just spent the last five days of my life crying in Argentina".
"I went hiking on the Appalachian Trail aka got me some Argentinian tail"
by hailsfromSC June 24, 2009
 
3.
The shit marks you leave on your cousin's chest when you tit-fuckher.
"Man, after I got through tit-fucking my cousin, her chest looked like a map of the Appalachian Trail!"
by Chefguy February 29, 2012