Uhhh (say it like Jay-Z) is a term created by the one named George Jones of Lehman PA. According to Jones, "Uhhh" is to be pulled out when there is awkward silence. It also may be used in the context for someone to stop talking about a particular subject because someone is in the room that they don't want to know about what the conversation is about..or just plain used to talk behind someones back.
Ryan: "So we going to the party?"
George: "Uhhh is such a douchebag"