The 'But He Wasn't Your Daddy' meme originates from a poignant moment in the 2017 Marvel film Guardians of the Galaxy Vol. 2. In this scene, the character Yondu Udonta reconciles with Peter Quill, emphasizing that while Ego was his biological father, Yondu was the one who actually raised and protected him. The phrase quickly became a viral sensation for its emotional depth and has since been repurposed to highlight the difference between biological ties and true parental care. Users often apply this template to fictional mentors, step-parents, or even inanimate objects that provide more support than the original versions, turning a tear-jerking movie moment into a versatile tool for social commentary and heartfelt gratitude.