"not the sharpest tool in the shed" meaning in English

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          "ref": "1999, Greg Camp (lyrics and music), “All Star”, in Astro Lounge, performed by Smash Mouth, Los Angeles: Interscope Records, track 2:",
          "text": "Somebody once told me the world is gonna roll me\nI ain't the sharpest tool in the shed.",
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        "Lacking in intelligence; dimwitted."
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        "(humorous, euphemistic) Lacking in intelligence; dimwitted."
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        {
          "word": "not the brightest bulb in the chandelier"
        },
        {
          "word": "not the sharpest crayon in the box"
        },
        {
          "word": "not the sharpest knife in the drawer"
        },
        {
          "word": "not the sharpest tool in the box"
        },
        {
          "word": "dumb as a bag of hammers"
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          "word": "dumb as a box of rocks"
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          "word": "stupid"
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        "(humorous, euphemistic) Lacking in intelligence; dimwitted."
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          "word": "not the brightest bulb in the chandelier"
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        {
          "word": "not the sharpest crayon in the box"
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        {
          "word": "not the sharpest knife in the drawer"
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        {
          "word": "not the sharpest tool in the box"
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