"sack-whack" meaning in English

{
  "forms": [
    {
      "form": "sack-whacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sack-whack (plural sack-whacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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          "parents": [
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          "kind": "other",
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            "Lemmas"
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          "name": "English terms with non-redundant non-automated sortkeys",
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      ],
      "examples": [
        {
          "ref": "2014, Robert Muchamore, Rock War: The Audition, Hachette",
          "text": "‘Sack whack!’ Poppy said, retreating from a deft move in which she'd slapped Fergal between the legs with the back of her hand.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A slap in the testicles."
      ],
      "id": "en-sack-whack-en-noun-sn1RDMdj",
      "links": [
        [
          "humorous",
          "humorous"
        ]
      ],
      "raw_glosses": [
        "(slang, humorous) A slap in the testicles."
      ],
      "synonyms": [
        {
          "word": "sack whack"
        }
      ],
      "tags": [
        "humorous",
        "slang"
      ]
    }
  ],
  "word": "sack-whack"
}

{
  "forms": [
    {
      "form": "sack-whacks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sack-whack (plural sack-whacks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English humorous terms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English rhyming compounds",
        "English slang",
        "English terms with non-redundant non-automated sortkeys",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2014, Robert Muchamore, Rock War: The Audition, Hachette",
          "text": "‘Sack whack!’ Poppy said, retreating from a deft move in which she'd slapped Fergal between the legs with the back of her hand.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A slap in the testicles."
      ],
      "links": [
        [
          "humorous",
          "humorous"
        ]
      ],
      "raw_glosses": [
        "(slang, humorous) A slap in the testicles."
      ],
      "tags": [
        "humorous",
        "slang"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "sack whack"
    }
  ],
  "word": "sack-whack"
}