Euphemism used mostly by politicians for spending time with a South American mistress, most commonly Argentinian.
Sorry I didn't call, dear. I was busy Hiking in the Appalachians and couldn't get phone service.
by capt. planet June 24, 2009
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In June, 2009, South Carolina governor Mark Sanford disappeared from public sight for five days, a period during which neither his wife nor much of his staff apparently knew where he had gone. A Sanford spokesperson eventually told reporters that the Governor was on a secretive hike along the Appalachian Trial to clear his head after a tough legislative session. Turns out that Sanford had actually been in Argentina where he had been conducting an extra-marital affair.
"Why is Bob's wife angry with him?"

"He got caught hiking the Appalachian, if you know what I mean."
by bobjones55 June 24, 2009
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When a peg-legged hillbilly chases a girl around the house, pins her in a corner, and proceeds to have anal sex. The "thunder" reference comes from the sound of thunder as his peg leg bounces on the floor during the chase. Appalachian Thunder is often finished off by a solid donkey punch.
"Hell fire, did you hear about Billy Bob running an Appalachian Thunder on his cousin? Sure did, but the jokes on him cause she has AIDS"
by T--Rex April 9, 2009
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When you finish in a girl’s anus and hold cum in until it boosts out of the side.
Person 1:Your girlfriend sure looks tired

Person 2: Yep, she hasn’t been able to walk correctly since I gave her the Appalachian Dam.
by CaptainSivDad October 19, 2019
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Code for having an affair.

In the case of a Republican, more often than not it'll be a same-sex affair.
I hold a high-stress political job and my wife refuses to give head. I guess I'll have to go hiking the Appalachian when the current legislative session is over.
by Dr. Zoid Johnberg June 24, 2009
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Code for cheating on your spouse, significant other.
"If anyone needs me, I'll be hiking the Appalachians." -Gov. Mark Sanford

Guy 1: Dude, where were you Saturday night? I thought I'd see you at the club with your girl.
Guy 2: Nah, man, I was hiking the Appalachians.
by Bert-Bert June 24, 2009
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when a man is having sex with a woman from behind and before he cums he pulls out his dick from her pussy and drops spit on her ass crack at the same time to make her think he is done then when she turns around to finish him off he blasts her in the face with his jizz
ass pussy cum jizz sex appalachian ambush
by papajapeto September 11, 2010
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