<Li> Patrick Boomhauer (nephew) </Li> <Tr> <Th> Nationality </Th> <Td> American </Td> </Tr> <P> Jeffrey Dexter "Jeff" Boomhauer III, commonly referred to as Boomhauer, is a fictional character in the Fox animated series King of the Hill . The character is voiced by series creator Mike Judge, and is best known for his fast - paced voice and nearly incomprehensible speech . </P> <P> Jeffrey Dexter "Jeff" Boomhauer III (born April 7, 1962) is the high school friend and neighbor of the characters Hank Hill, Bill Dauterive, and Dale Gribble . His first name was only spoken in the TV series during the season 13 episode, "Uh - oh, Canada", when the Canadian woman with whom he'd switched houses for the summer said, "Hello, Jeff . Oh my, it's the fifteenth already?". His driver's license as shown in the series finale reads simply "Boomhauer, Jeff". </P>

Who does boomhauer's voice on king of the hill