What do ye think are the most disgusting words in English? Most words evoke some sort of feeling or response in you, for example if I say "jump", you might get a different image in your head than if I said "leap". What word makes you cringe when you hear it?
A common one is moist. And one that I just said a few seconds ago and so gave me the idea for the thread... puke.
Both pretty nasty, but I'm sure you wonderful folks have more ideas!