Definition of fish story in English:

fish story

noun

US
informal
  • An incredible or far-fetched story.

    • ‘But those are fish stories, anecdotal evidence at best.’
    • ‘The fish stories kept getting bigger and bigger until even he couldn't believe what he'd done this time.’
    • ‘The action never stopped the rest of the day, and if you think this is just another fish story, I've got it all on videotape.’
    • ‘However, I think my first-grade students might have a few new fish stories to share.’
    • ‘Are you willing to swear you're not feeding me a fish story?’