"no more Mr. Nice Guy" meaning in English

{
  "etymology_text": "It is possible the phrase was popularized in the Alice Cooper song of the same name.",
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        "head": "no more Mr. Nice Guy"
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      "expansion": "no more Mr. Nice Guy",
      "name": "head"
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  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
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      "examples": [
        {
          "ref": "1973, Alice Cooper and Michael Bruce (lyrics and music), “No More Mr. Nice Guy”, in Billion Dollar Babies:",
          "text": "\"No more Mr. Nice Guy, No More Mr. Clean, No more Mr. Nice Guy, they say \"he's sick, he's obscene!\"\"",
          "type": "quote"
        },
        {
          "ref": "2003 August 19, \"Ed Anger\": Weekly World News, page 17:",
          "text": "You heard me right, buckaroos—no more Mr. Nice Guy. If those dagger-throwing Ali Babas are so keen on acting like the gol-durned Vietcong, I say let's treat 'em like the gol-durned Vietcong.",
          "type": "quote"
        },
        {
          "ref": "2007, Gene W. Kidd, Spotlight, →ISBN, page 141:",
          "text": "\"I'm outta here. Kian, watch yourself please,\" Bobby said.\n\"Bobby, watch yourself please,\" Kian said, sarcastic.\n\"That's it Kian. No more Mr. Nice Guy. Do not get in my way. You...\" Bobby said.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An implied individual has ceased being pleasant, and will now resort to unpleasant means to attain their objectives."
      ],
      "id": "en-no_more_Mr._Nice_Guy-en-phrase-w7huW~QC",
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        ],
        [
          "pleasant",
          "pleasant"
        ]
      ],
      "related": [
        {
          "sense": "the",
          "word": "gloves are off"
        }
      ],
      "synonyms": [
        {
          "word": "no more Mr Nice Guy"
        },
        {
          "word": "no more Mister Nice Guy"
        }
      ],
      "wikipedia": [
        "No More Mr. Nice Guy (song)"
      ]
    }
  ],
  "word": "no more Mr. Nice Guy"
}

{
  "etymology_text": "It is possible the phrase was popularized in the Alice Cooper song of the same name.",
  "head_templates": [
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      },
      "expansion": "no more Mr. Nice Guy",
      "name": "head"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "phrase",
  "related": [
    {
      "sense": "the",
      "word": "gloves are off"
    }
  ],
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      "examples": [
        {
          "ref": "1973, Alice Cooper and Michael Bruce (lyrics and music), “No More Mr. Nice Guy”, in Billion Dollar Babies:",
          "text": "\"No more Mr. Nice Guy, No More Mr. Clean, No more Mr. Nice Guy, they say \"he's sick, he's obscene!\"\"",
          "type": "quote"
        },
        {
          "ref": "2003 August 19, \"Ed Anger\": Weekly World News, page 17:",
          "text": "You heard me right, buckaroos—no more Mr. Nice Guy. If those dagger-throwing Ali Babas are so keen on acting like the gol-durned Vietcong, I say let's treat 'em like the gol-durned Vietcong.",
          "type": "quote"
        },
        {
          "ref": "2007, Gene W. Kidd, Spotlight, →ISBN, page 141:",
          "text": "\"I'm outta here. Kian, watch yourself please,\" Bobby said.\n\"Bobby, watch yourself please,\" Kian said, sarcastic.\n\"That's it Kian. No more Mr. Nice Guy. Do not get in my way. You...\" Bobby said.",
          "type": "quote"
        }
      ],
      "glosses": [
        "An implied individual has ceased being pleasant, and will now resort to unpleasant means to attain their objectives."
      ],
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        ]
      ],
      "wikipedia": [
        "No More Mr. Nice Guy (song)"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "no more Mr Nice Guy"
    },
    {
      "word": "no more Mister Nice Guy"
    }
  ],
  "word": "no more Mr. Nice Guy"
}