Okay, here's an example I lifted from the "Awesome: Fan-Art Thread". I hate that thread because, while a lot of it is fucking weird, a few pictures are stuff I've seen before, and it reminds me I've got a weird fetish.
This is a really tame one, and this is more along my speed basically. It's not "fat girls", it's like when a skinny person gets really fat. I've always been aroused by this. Of course I have limits. I don't like when it involves the person experiencing serious pain, exploding, anything gory or bizarre. Basically just when a person gets really fat by eating food. Also, I usually like it if the person getting fat enjoys it, and if there's sort of a "dominating" aspect, like they're proud of themselves and not embarrassed.