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The words Mad and bald put together. Someone who is Mald is either a mad and bald person, or a person who is Mad about being bald, and is therefore taking their frustration out on others.
Mike: Ha! Nice hair bro
John: Dude shut up, they shaved my head while I was sleeping you should have stopped them.
Mike: Why are you blaming me for you having too many drinks and passing out? You're so Mald.
by Yozaru November 09, 2011
Repeating an answer after someone has already said the correct answer.
Mike: "2+2 is 4."
Paul just "Mal'd" Mike there!