diddly squat

/ˈdɪdli ˌskwɑt/
noun
  1. Absolutely nothing; a very small or worthless amount.
    • He complained all day but did diddly-squat to help.
    • The company paid me diddly-squat for my overtime.
    • You know diddly-squat about my life, so don't judge me.
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