When someone, typically a Becky, tries to explain your culture to you.
Becky: I see what you're saying, but I don't think you really understand the Mexican culture that much. You see, Mexicans traditionally—
Juanita: Shut yo ass up Becky! Don't try to culture-splain wit yo jesus sandals wearing, "Can I get a Grande, Iced, Sugar-Free, Vanilla Latte With Soy Milk" looking ass!
When a person of another culture starts explaining how their culture works before even realizing that you might know what it is.
Shut yo ass up Jorge! Don’t try to culture-splain wit yo Speedy-Gonzales lookin ass”