Definition of shaggy–dog
: of, relating to, or being a long-drawn-out circumstantial story concerning an inconsequential happening that impresses the teller as humorous or interesting but the hearer as boring and pointless; also : of, relating to, or being a similar humorous story whose humor lies in the pointlessness or irrelevance of the plot or punch line a shaggy–dog comedy
From the M-W Editors
1946
First Known Use of shaggy–dog
1946
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