A word used as a rebuttal to a question or suggestion that you don't want to hear.
Someone says to you hey man pass that blunt you are taking forever with it. You simply look at them and say Hurm. The length of the Hurm depends upon the situation a more strange question makes for a longer Hurm. If someone says hey man you better give me some money right now. You reply with a HURRRRRMMMMMM.