Femboy Friday is a recurring internet celebration that gained significant traction on platforms like Tumblr, Twitter, and TikTok during the late 2010s. It serves as a day for gender-nonconforming individuals, particularly feminine-presenting males, to share photos, artwork, and celebratory memes. Often characterized by pastel aesthetics, thigh-high socks, and anime-inspired imagery, the trend has evolved from a niche community event into a widely recognized weekly tradition. While it started as a way to promote visibility and self-expression, it is now used both as a genuine celebration of gender expression and a lighthearted internet trope within various online subcultures.