An expression combining "hmm" and "what?"
Used when in confusion or doubt.
Paul: Agaga baalgajo ogishaooo igjaowii appa wwi hhhab htaihth.
Drew: Hmwha? (I don't understand your crazytalk)
Paul: I had some juicy awesome watermelon flavored sex with my boyfriend's ex platypus last night in my pontoon boat even though it was hailing.
Drew: Hmwha? (you're making this up, no one would do you.)