鱼头怪

Meaning

Refers to Hainan Province. Hainan's pleasant climate attracts many "migratory bird elderly" from Northeast China to spend winter there. In winter, when islanders walk around or take buses, they often hear Northeastern dialect. The Northeast has 3 provinces, but in winter it gains a 4th: Hainan. Note: This term doesn't target any group, it's just teasing.