It's possible you've misheard or misremembered a similar phrase. Here are some possibilities:
* "Cotton candy": This is a sweet, fluffy treat that's often associated with carnivals and amusement parks.
* "White as cotton": This refers to something that is very white, like the color of cotton.
* "Sold down the river": This idiom means to be betrayed or tricked. It originated from the practice of selling slaves down the Mississippi River, away from their homes and families.
If you could provide more context about where you heard the phrase, I might be able to give you a more accurate answer.