To some online sources, it is used for both. > "Yah": slang spelling of the word "yeah" (which of course can also be used ironically) > Merriam-Webster: "Yah"

To some online sources, it is used for both. > "Yah": slang spelling of the word "yeah" (which of course can also be used ironically) > Merriam-Webster: "Yah": used to express disgust, contempt, defiance, or derision; probably imitative of the sound of retching