In this article, I treat a literary text as a form of somatechnics making an intervention in fat embodiment. I read contemporary American author Shelley Jackson's short story ‘Fat’ from The Melancholy of Anatomy through what Elizabeth Wilson terms ‘gut feminism’, a feminism accounting for the dynamism of the biological body and acknowledging ‘organic thought’ as an alternative to the mind/body split. Wilson's ‘gut feminism’ is related to theories drawing on Deleuze's concept the ‘Body without Organs’ such as hypertheorist N. Katherine Hayles’ argument for the ‘Text as Assemblage’. I show how the seemingly surreal narrative of ‘Fat’ provides crucial insights about fat, understood as an assemblage of images, affects and matter and as a liminal substance questioning the integrity of the subject. Fat is associated with the feminine in a reclamation of the early modern rhetorical term ‘dilation’, which figures the swelling text as a fat, fertile woman with voracious orifices. I describe how Jackson's ‘aesthetics of fat’ works through dilation, disgust and ‘bad taste’ to draw the reader into an experience of fat embodiment. I characterise fat as a ‘sticky sign’ in Sara Ahmed's sense, one that will not stay confined to the page but sticks to the reader and elicit gut reactions. In conclusion, I argue for a non-derogatory model of reading as incorporation.