山寨，original meaning is a complex in a mountain, for example: 那是一个山寨，that is a complex in the mountain.
But now, It has a new meaning--counterfeited goods. For example: 这是一个山寨苹果手机。This is a counterfeited iPhone.
粉丝，original meaning is green bean noddles, a type of Chinese food, are made from green bean. Now, 粉丝 are popularly used as Fans追随者, because it pronounces alike . For example: 这个明星有很多粉丝, This movie star has many fans (not green bean noodle).
Moreover, some people even use it as verb, means Like: 我很粉他， I like him very much.