The 'Dude! Let Me In! I'm A Fairy!' meme features a close-up photograph of a large moth, typically a Polyphemus moth, clinging to a window pane. Its popularity surged in the early 2010s, stemming from various image-sharing boards like Reddit and Tumblr. The humor arises from the contrast between the moth's slightly unsettling, fuzzy appearance and the desperate, high-energy caption claiming to be a magical fairy. It is widely used as a metaphor for something unwanted or suspicious trying to gain entry by pretending to be something innocent or desirable, often applied to pop culture, gaming, or relatable social awkwardness.