倒吊冇滴墨水 (dou3 diu3 mou5 dik1 mak6 seoi2) — hanging upside down without dropping one drop of ink, which means a person seems to know a certain thing, but actually is clueless and lack of content in Cantonese
dou˗₃倒diu˗₃吊mouˏ₅冇dikˉ¹滴makˍ₆墨seoiˊ²水Mandarin Pinyin: dao4 diao4 mao3 di1 mo4 shui3
Meaning of 倒吊冇滴墨水
nounhanging upside down without dropping one drop of ink, which means a person seems to know a certain thing, but actually is clueless and lack of content