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1.
A joke, usually long, with a silly premise, often involving talking animals. Named for a classic joke involving a lost shaggy dog. Punch line: "Not that shaggy!"
The joke ended with "and that goes for your cat, too!" Just another shaggy dog story.
by cornholio October 11, 2003
 
2.
A long, convoluted anecdote, often told simply to result in a sentence that consists almost entirely of puns.

.
One classic shaggy dog story involves a man named Hugh who is out to stop a couple of monks from growing flowers for money:

"Remember Hugh, and only Hugh, can prevent florist friars."

.
by al-in-chgo March 13, 2010
 
3.
aka feghoot
Check out my definition of feghoot!
Shaggy-Dog Story is found at Websters' feghoot is not! Man, are the guys at Websters' slow!
by abracadabra January 18, 2004