[shag.gy-dog story] n (1946): a long-drawn-out circumstantial story concerning an inconsequential happening that impresses the teller as humorous but the hearer as boring and pointless; also: a similar humorous story whose humor lies in the pointlessness or irrelevance of the punch line
SHAGGY-DOG STORY
Meaning of SHAGGY-DOG STORY in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012