神出鬼沒 (san4 ceot1 gwai2 mut6) — (said of sb who happens to) appear and disappear mysteriously in Cantonese
sanˎ₄神ceotˉ¹出gwaiˊ²鬼mutˍ₆沒简 神出鬼没
Mandarin Pinyin: shen2 chu1 gui3 mo4
Meaning of 神出鬼沒
noun(said of sb who happens to) appear and disappear mysteriously