The word "yucky" is an adjective used to describe something that is unpleasant, disgusting or repulsive. It can be used to describe a person, place, thing or situation that one finds offensive due to its dirty, unhygienic or foul nature.
The Super Sensitive Shampoo & Bodywash is a two - in - one formula that uses organic soap bark as its foaming agent, and is free from all sorts of yucky stuff, like added fragrance and common allergens and irritants. (verywellfamily.com)
You've experimented with this before and found it to be an addictive substance that provides little real value and worse, most people think it causes cancer, diabetes, fat gain, and a host of other yucky stuff. (fitnessandpower.com)