'歪风' literally combines '歪' (wāi), meaning 'crooked', 'askew', or 'deviant', and '风' (fēng), meaning 'wind'—but here used metaphorically to mean 'trend', 'custom', or 'prevailing atmosphere'. Together, the term describes an unhealthy, undesirable, or morally corrupt social trend or practice that spreads like a wind, influencing behavior negatively. It often appears in official discourse, media commentary, or public discussions about ethics, discipline, or social norms.

The phrase carries a strong evaluative and critical tone—it is never neutral. You’ll commonly encounter it in contexts such as anti-corruption campaigns, education reform (e.g., opposing exam cheating or grade inflation), or calls for integrity in workplaces. While not slang, it’s formal yet accessible, frequently used in both written and spoken standard Mandarin when condemning widespread but harmful behaviors.