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Jyutping mou4 hou2 sai3
Pinyin wú hǎo shì

Definitions (Wiktionary)
  1. intj, Min-Nan
    sorry; excuse me
    (syn.) 䆀勢, 失禮, 對不住, 歹勢, 對毋住, 對勿起, 斯里麻生, 壞勢, sor informal, 交代勿過, 對不起, 勿好意思, sorry, 對唔住, 敗勢, 歪勢