Does hearing someone say "moist" make your skin crawl? If so, you're part of the 10-20% of the population that has a repulsive reaction to that particular word. If you are grossed out by certain everyday words, you may be experiencing a phenomenon called word aversion. There are several theories as to why some ordinary words may repel people. One theory is that an aversion to a particular word is contagious -- as people learn that others are grossed out by a word, they start to feel that way too. Another theory, especially in the case of the word "moist," is that it connotes bodily functions that some people find disgusting.