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Jyutping aa3 gwan1 maai6 daai6 tau4
Pinyin ā jūn mài dà tóu

Definitions (粵典–words.hk)
  1. 語句、舊式
    歇後語​,​下句​係​「​好​噏​唔​噏​」​,​即​係​話​應該​講​嘅​就​唔​講​、​唔​應該​講​嘅​就​講​;​故仔​係​有​個​叫​阿​均​嘅​人​賣​大​頭​魚​,​啲​客經過​見​啲​魚唔​郁​,​見​唔​新鮮​唔​買​,​啲​客​走​咗​,​啲​魚先​至口​噏​噏​。
    a sandwich pun that means one speaks what he should not speak and doesn't speak what he should have spoken