山寨 = knockoff

Oeasy

2 o- E% H6 {, M4 n, }$ S- Who is the iPhone GUY? https://www.youtube.com/watch?v=rdKV6x13cz8
08:10 山寨 literally translates to knockoff...

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https://dict.hjenglish.com/w/knockoff
7 {) L8 m2 G% u: e+ `" T

<非正式>（廉价的）冒牌货，仿制品，山寨产品
  \8 U* }/ L. M; _/ X# UNowadays it can be hard to tell if a product is the genuine article or a knockoff.
如今很难判断一个产品是正品还是仿品。

Toyger

我觉得这种流行词还是日语方面做的不错，直接照搬中文，加个读音（サンザイ）就能用了。