Polyester has become a viral insult among Gen Z, but what does it really mean? In this article, we delve into the complex meaning and implications of this term, exploring its origins, cultural significance, and impact on Gen Z's perception of authenticity and quality. From its roots in the video editing community to its current usage as a slang term, polyester represents a deeper concern about the authenticity and quality of online content and personal presentation. We also examine how polyester fits into a broader trend of Gen Z slang terms focused on authenticity and quality, such as larping and industry plant, and how it reflects the generation's heightened insecurities and concerns about social currency and online identity.