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1.
The act of shaking a carbonated alcoholic beverage and and allowing the liquid to shoot up through the neck of the bottle and into the persons anus. This allows the alcohol enter into the bloodstream faster than oral intake.
"My friend died because of careless butthole surfing."
"You should really stop drinking, butthole surfing is the way to go."
by Kitface May 04, 2007
 
2.
When a dog drags itself across the floor so as to wipe its ass, usually with it's forelegs. May be due to a turd stuck in the butt or general discomfort.
My dog licked his butt so much, he had enough hair in his poop to have a turd hanging off when he came inside. I didn't see it untill he started "butthole surfing" across my new rug. I had to chase him outside and wash that rug. Damn dog.
by The Edgehead June 04, 2009