Is it possible to use "what can I say except you're welcome" in daily conversation?
Yes, it is possible, but it depends on the context. Now that this song has become very popular, many people know this lyric and if you were to say this exact sentence, it may sound very scripted or unnatural. However, variations of this sentence may be more common to use, possibly during a time when someone thanks you and you don't know how to respond because you are embarrassed or feel awkward. Here's one example: Ex: I don't know what to say, except you're welcome I guess.
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