What is the meaning of idiomatic expression rinsing cottage cheese?

The expression "rinsing cottage cheese" is not a common idiom in English. There's no established meaning or usage associated with it.

It's possible that you heard it in a specific context, or it's a unique phrase from a particular region or community.

To understand what it might mean, you would need more context:

* Where did you hear it? Was it in a conversation, a book, a movie?

* Who said it? Did someone explain the phrase, or was it used in a particular situation?

Without more information, it's impossible to decipher the meaning of "rinsing cottage cheese."