Interesting thread. Though i'm not sure I know any food that's really disgusting. Mainly because I'm very wary when it comes to food and just never try anything I don't like the look of. I'm no fun of "сало" (lard?) -- just don't eat it. But in fact, I've never even tried it. There's a moment in the film "Ballad of a soldier" where the main heroine eats it -- a huge chunk of it, I thought it looked kinda disgusting. But perhapr when you're really hungry...

Regarding some other stuff mentioned here --

"холодец" -- don't eat it but don't think it's exactly disgusting.

"селедка/сельдь под шубой"/dressed herring (literally: herring under a furcoat) -- don't eat the herring part, adore the "шуба"/dressing part (the combination of boiled grated beetroot with mayonnaise. Yum.
http://ru.wikipedia.org/wiki/%D0%A1%...B1%D0%BE%D0%B9

"noodles in milk" (or whatever you call it) -- like it. Simple sweet dish, it just should be done properly or the nasty milk parts should be removed.

There is one Japanese thingy which I haven't tried but the description of it sounds really strange -- natto



Nattō is a traditional Japanese food made from soybeans fermented with Bacillus subtilis. It is popular especially as a breakfast food. As a rich source of protein, nattō and the soybean paste miso formed a vital source of nutrition in feudal Japan. Nattō can be an acquired taste because of its powerful smell, strong flavor, and slippery texture.