big answer: I am extremely traumatized with my bio mom's behavior and bigotry towards me so I take pleasure and humor into sexualizing a fictional mom character especially as a coping mechanism.
I completely get that. Admittedly, I did have my unapologetic love for fat women in me when very young (to the point of thinking the word fat was a compliment and getting in trouble for using it on my favorite kindergarten teacher), but I went the extra step of being that fat mom for others too.
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short answer: toriel fat woman hot.
*howling. the audience is full of dogs