Uh... no, it can't. You could just say, "Puking into a toilet," instead of, "Speaking Chinese." That was incredibly insulting to them (even despite their society facing all sorts of issues). What if I said that pooping off the edge of a skyscraper could be called, "Speaking American?"

They're equally preposterous. Idk where your relative got that phrase from but it's certainly not well-known, nor should it be well-received.