Etymology

shaggy dog story

shag·gy dog sto·ry

Today it means: An intentionally long-winded joke or tale featuring the narration of typically irrelevant details, and usually ending with an absurd or pointless punchline which is often a pun or Spoonerism on a known catchphrase, with the intended humor deriving from the combination of the excessive length and the anticlimax. Full definition →

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The story

Uncertain; probably from one of two jokes, one in which a protracted search for an alleged remarkably shaggy, talking dog ends in the discovery of the dog which, though it can indeed talk, is disappointingly not so shaggy after all; or one in which an even more protracted search for the shaggiest dog in the world ends in the utterly anticlimactic punchline “Now that’s a shaggy dog!”.

Etymology from Wiktionary, CC BY-SA 4.0.