What does ni GUI xing mean in English?

"Ni GUI xing" (你鬼行) translates to "You are a ghost" in English. It can imply that someone is acting mysteriously or unexpectedly, often used in a playful or teasing context. The phrase combines "ni" (you) with "gui" (ghost) and "xing" (to walk or act). It's not a common expression but can convey a sense of intrigue or surprise regarding someone's behavior.