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Jyutping mun6 dou3 cau1 gan1
Pinyin mèn dào chōu jīn

Definitions (CC-CANTO)
  1. adj; to feel boring until cramping, meaning something is dreadfully boring
Definitions (粵典–words.hk)
  1. 語句、俚語
    誇張​地​比喻​一個​人悶​到​好似​就​嚟​抽筋
    to be bored out of one's mind, to be extremely bored; literally: so bored that one gets cramps
    • 打機有時真係悶到抽筋。
      打机有时真系闷到抽筋。
      daa2 gei1 jau5 si4 zan1 hai6 mun6 dou3 cau1 gan1.
      Sometimes, playing computer games bores me out of my mind.
Examples (Tatoeba—Cantonese-English)
  1. Cantonese
    堂课闷到抽筋。
    堂課悶到抽筋。
    tong4 fo3 mun6 dou3 cau1 gan1 。
    • The lecture was a total snoozefest.
Examples (粵典–words.hk)
  1. Cantonese
    打机有时真系闷到抽筋。
    打機有時真係悶到抽筋。
    daa2 gei1 jau5 si4 zan1 hai6 mun6 dou3 cau1 gan1.
    • Sometimes, playing computer games bores me out of my mind.