The 15 upvoters who preceded me seem to have firmly grasped this definition. For the rest of us:

Bimbofication is a practice, kink, or fetish that involves role-playing and transforming oneself into a stereotypical portrayal of a “bimbo,” characterized by exaggerated femininity, playful behavior, and a carefree attitude. It emphasizes empowerment and self-expression, allowing individuals to embrace their sexuality and challenge societal norms.

There’s also the less self-empowered variety where the transferred person not only looks and behaves like an exaggerated Barbie doll but is supposed to become that airheaded. Like so often, the lines between these varieties are blurry.

By the way, I find it rather telling that bimbo fetish is becoming more popular at a time when all of the MAGA women are doing their best to look like mass-produced plastic dolls… Exposure does a lot to drive preferences.