"Oh, you know baat waa?"

After hearing I can speak/understand a little, I hear some people say, "咦？你識聽baatwaa?" I'm assuming this means "Cantonese", but I can't find any references in CantoDict. It sounds like bat3 waa2 or baat3 waa2 ..... baat話. Is this a regional or 廣東 thing? Perhaps I'm mis-hearing...