Hong Kong Trip Essentials: 9 Must-Know Cantonese Slang Phrases

黐線 (Chi sin) = “Crazy”

The literal meaning of this phrase is “glued wires”, and some argue that this expression refers to the person’s brain’s neural circuits being stuck together, making that person crazy. Not only do people use this phrase to call someone insane, but they also exclaim it in disbelief — “Chiiiiii sin!”, similar to English speakers’ “No waaaay!”