Duncan Joseph, known online as duncanyounot, is a prolific American comedian and content creator who has cultivated a massive following, particularly on TikTok and YouTube. Originally from Seattle and with a background in high school theatre, Duncan later moved to Los Angeles and New York City, drawing inspiration from urban life for his comedic material. He is primarily celebrated for his sharp, relatable humor and the creation of distinct character personas, most famously his satirical "Mom" and "Karen" archetypes. His content spans various formats, with highly popular prank calls involving these characters interacting with real-world businesses and online communities, such as his viral "I Put 1000 Fake Moms in a Facebook Group" video. Duncan also excels in reaction content, providing comedic commentary on viral videos, internet trends, and cringe culture. He creates engaging gameplay videos featuring games like Roblox and The Sims, often injecting his character work or trolling into these virtual environments. Furthermore, he produces comedic "educational" videos that touch on topics like healthcare, finance, and AI disinformation through the perspective of his personas. Having successfully transitioned to longer-form YouTube content, Duncan consistently collaborates with other prominent creators, including appearances on platforms like Jubilee. He is managed by Palette Management and is recognized for his witty observations, clever editing, and ability to blend character-driven comedy with commentary on contemporary online life.