"says you" meaning in English

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  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "text": "Hot dogs are the best food ever! — Says you!",
          "type": "example"
        },
        {
          "text": "My car is the fastest car in this whole parking lot! — Says you. Prove it, let's race.",
          "type": "example"
        }
      ],
      "glosses": [
        "a statement of disagreement or disbelief, especially when highlighting hypocrisy"
      ],
      "id": "en-says_you-en-phrase-6T0PBRu2"
    }
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  "word": "says you"
}

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      "expansion": "says you",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "text": "Hot dogs are the best food ever! — Says you!",
          "type": "example"
        },
        {
          "text": "My car is the fastest car in this whole parking lot! — Says you. Prove it, let's race.",
          "type": "example"
        }
      ],
      "glosses": [
        "a statement of disagreement or disbelief, especially when highlighting hypocrisy"
      ]
    }
  ],
  "word": "says you"
}