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You can say all sorts of inarticulate sounds if you want to, properly you'd say "uh". Bah is also more of an interjection - like expression of annoyance (I haven't heard it that often, it's also like Humbug used more in American English). It also depends if it's American English or British English - there are some differences. I am also a Pole who lived in Australia for an extensive period of time (so Australian English is closer to British English).