The 'Belle Delphine Effect' refers to the massive cultural impact and polarizing internet presence of influencer Belle Delphine during the late 2010s. Characterized by her e-girl aesthetic and viral marketing stunts—most notably the 'Gamer Girl Bath Water'—she became a symbol for the rise of simp culture and the power of digital branding. The meme is used to describe a radical change in behavior or appearance caused by internet influence, often highlighting the absurdity of viral trends. It serves as a commentary on how quickly online personalities can shift mainstream culture and consumer behavior through shock factor and aesthetic appeal.