"get this" meaning in English

{
  "head_templates": [
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      "expansion": "get this",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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          "source": "w"
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      "examples": [
        {
          "ref": "2015, Suzanne Brockmann, Get Lucky",
          "text": "She opened her eyes about an hour after Blue arrived, and—get this! She looks at him and she goes, 'I'm bald. They had to shave my head.'",
          "type": "quotation"
        },
        {
          "ref": "2017 May 13, Barney Ronay, “Antonio Conte’s brilliance has turned Chelsea’s pop-up team into champions”, in the Guardian",
          "text": "Plus Kanté is something new. Get this: Chelsea have the most popular player in the league, a man nobody could seriously boo, albeit even the notably lovable Kanté is perhaps a little fetishised in his humility, his scooter-riding, the Premier League’s own friendly, scuttling Bilbo Baggins.",
          "type": "quotation"
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      ],
      "glosses": [
        "Used to emphasize or call attention to the next thing that is said."
      ],
      "id": "en-get_this-en-phrase-lliYAlmt",
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          "emphasize",
          "emphasize#English"
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          "attention",
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  "sounds": [
    {
      "audio": "en-us-get-this.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/2b/En-us-get-this.ogg/En-us-get-this.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/2b/En-us-get-this.ogg",
      "tags": [
        "US"
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      "text": "Audio (US)"
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  ],
  "word": "get this"
}

{
  "head_templates": [
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      "expansion": "get this",
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "2015, Suzanne Brockmann, Get Lucky",
          "text": "She opened her eyes about an hour after Blue arrived, and—get this! She looks at him and she goes, 'I'm bald. They had to shave my head.'",
          "type": "quotation"
        },
        {
          "ref": "2017 May 13, Barney Ronay, “Antonio Conte’s brilliance has turned Chelsea’s pop-up team into champions”, in the Guardian",
          "text": "Plus Kanté is something new. Get this: Chelsea have the most popular player in the league, a man nobody could seriously boo, albeit even the notably lovable Kanté is perhaps a little fetishised in his humility, his scooter-riding, the Premier League’s own friendly, scuttling Bilbo Baggins.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Used to emphasize or call attention to the next thing that is said."
      ],
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          "emphasize",
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          "attention",
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  "sounds": [
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      "audio": "en-us-get-this.ogg",
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  "word": "get this"
}