"What do you mean?" = "o que" or "que"?
I told a story to my brasilian friend, and he replied "hummm". I want to ask him what he means by writing "hummm". Like "hahaha, what do you mean with "hummm"? :P" but I just want to say "hahaha what?". How do I say this in portuguese? Can I write "hahaha o que?" or "hahaha que?" or does this sound rude/wrong?
Thanks