I realize the question the OP asked is directed at men, but being bisexual I think my opinion of what makes a pussy attractive is valid enough.
As for a fat pussy (not a fat person's pussy) great, love it. I actually prefer when lips have some fullness to them. But my only 'turn off' for any pussy is if it is really hairy, and that is just a personal preference, which at times I can, and have, looked past. The only time I would be repulsed (as mentioned in the title) was if it was unclean.
On a fetish site with such diverse interests, preferences, and opinions, I think the only thing we can actually agree on is that whatever you have between your legs should be clean. Repulsion is perfectly valid if it's not.
As for a fat person's pussy (or just a fat person in general) I would not be attracted to. Nothing to do with their pussy, just what surrounds it. I agree with Susie and the others on that (though I can accept a bit more than 5% above normal body weight). Most people are, and should be heavier than I am. I'm 5'2. If you have GG boobs, they're not going to fit into a size 6 (US size 2) top. I'm not asking for a ballerina body, just slim (I would actually prefer a little heavier than normal to a ballerina body). My body is not perfect, and I don't expect anyone's to be.