What does No sabe que yo estoy diciendo gringa mean in English?

"No sabe que yo estoy diciendo gringa" is a Spanish phrase that translates to:

"She doesn't know that I'm saying gringa."

Here's a breakdown of the phrase:

* No sabe: She doesn't know

* que yo estoy diciendo: that I'm saying

* gringa: gringa (a term used to refer to a woman from the United States, sometimes with a slightly negative connotation)

The sentence implies that the speaker is secretly referring to someone as a "gringa" while that person is unaware of the comment.