The phrase translates roughly to "thick/curvy girl's pack" and usually refers to a collection of private photos or videos (a "pack") shared or sold by a woman who identifies with the "gordi buena" (curvy/thick) aesthetic [4].

While there isn't a study on that specific phrase, you can find academic research on the underlying themes through these topics:

Sociological studies in Spanish-speaking regions (particularly Mexico) examine this term as a subversion of traditional beauty standards, where "curvy" is celebrated rather than stigmatized [2, 3].

Feminist academic papers often explore the tension between the "body positive" movement and the commercialization or hyper-sexualization of "plus-size" bodies in digital spaces [3].