Theresa Duncan was born in Michigan. Details about her early childhood are scant, but it is known that she developed an early interest in art and culture that would significantly shape her future endeavors. This foundation in her formative years likely fueled her later creativity and critical lens.

Duncan moved to New York City and immersed herself in the city's vibrant underground art and music scene. She became known for her sharp wit, stylish persona, and participation in various creative projects, marking the start of her public artistic life. This exposure refined her aesthetic sensibilities and helped develop her voice as a critic.