an unsuccessful attempt to invoke the name of one's triad big brother or boss in order to get protection or to make an impression [colloquial]
Definitions (粵典–words.hk)
語句、俚語
喺響朵（黑社會見面通報姓名）嘅時候講大話，講一個假嘅組織名，或者冒認某人嘅手下 to falsely claim to belong to a triad group, or to use a fake organisation name that no one can recognise (in order to protect oneself)