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1.
To have a sexual encounter or affair, named after the infamous disappearance of South Carolina Governor Sanford, originally thought to be hiking the Appalachian Trail, but was having an extra marital affair in Argentina.
I wanted to Hike the Appalachian Trail in the back seat of my dad's Lincon after prom, but my date wasn't drunk enough.
by scexpat June 24, 2009
 
2.
What you say you did when you come back from being missing for several days in order to hide what you were really doing.
"Jim, why haven't you been at work the past 3 days?" "Oh, I thought I'd... uh... hike the Appalachian trail!"

"Bob, why did you come home late last night?" "Oh I thought I'd hike the Appalachian trail on the way home!"
by SonOfALink June 24, 2009