The phrase "yucky chemicals" refers to substances that are disliked or considered unpleasant because they are not natural or can be harmful to living things. Full definition
My husband started YummyEarth to make treats for our kids without yucky chemical ingredients. (crunchydomesticgoddess.com)
There isn't a day that I don't eat some form of dark chocolate and it is my life's mission to make every dessert possible made with real and simple ingredients that allow us to enjoy desserts that aren't filled with yucky chemicals or tons of refined sugar. (rachlmansfield.com)