"oh my stars" meaning in English

{
  "head_templates": [
    {
      "args": {},
      "expansion": "oh my stars",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1883, Charles Dickens, chapter XXVI, in Bleak House",
          "text": "\"O Lord!\" says Mr. Smallweed, panting. \"Oh, dear me! Oh, my stars! My dear friend, your workman is very strong—and very prompt. O Lord, he is very prompt! Judy, draw me back a little. I'm being scorched in the legs,\" which indeed is testified to the noses of all present by the smell of his worsted stockings.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An expression of surprise or astonishment."
      ],
      "id": "en-oh_my_stars-en-intj-kAv12fI7",
      "links": [
        [
          "surprise",
          "surprise"
        ],
        [
          "astonishment",
          "astonishment"
        ]
      ],
      "synonyms": [
        {
          "word": "wow"
        },
        {
          "word": "my stars"
        }
      ]
    }
  ],
  "word": "oh my stars"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "oh my stars",
      "name": "en-interj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English interjections",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "1883, Charles Dickens, chapter XXVI, in Bleak House",
          "text": "\"O Lord!\" says Mr. Smallweed, panting. \"Oh, dear me! Oh, my stars! My dear friend, your workman is very strong—and very prompt. O Lord, he is very prompt! Judy, draw me back a little. I'm being scorched in the legs,\" which indeed is testified to the noses of all present by the smell of his worsted stockings.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An expression of surprise or astonishment."
      ],
      "links": [
        [
          "surprise",
          "surprise"
        ],
        [
          "astonishment",
          "astonishment"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "wow"
    },
    {
      "word": "my stars"
    }
  ],
  "word": "oh my stars"
}