Urban Dictionary memes mimic the layout of the famous crowdsourced online dictionary for slang words and phrases. Founded in 1999 by Aaron Peckham, the site became a cultural staple for documenting internet culture and street vernacular. The meme format gained traction by allowing users to create satirical or hyper-specific definitions for their friends' names, everyday situations, or niche fandoms. By using the signature blue and white aesthetic, these memes provide an air of mock authority to personal inside jokes, making it one of the most relatable ways to define modern social dynamics and internet jargon.