亂咁舂 (lyun6 gam3 zung1) — to do sth pointless or having no intention in Cantonese
lyunˍ₆亂gam˗₃咁zungˉ¹舂简 乱咁舂
Mandarin Pinyin: luan4 han2 chong1
Meaning of 亂咁舂
nounto do sth pointless or having no intention
noun(adj.) describes someone who does something without directions; (phrasal verb) to do something without thinking thoroughly.