A4 waist challenge - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    a social media trend prompting women to upload photos of themselves comparing their waist measurements to a vertical piece of A4 paper

    The 'A4 waist challenge' sees ladies hold up a piece of paper to their stomach to prove their bodies are more narrow.

    Submitted by Boris Marchenko from Russian Federation on 16/03/2016