Werg

Origin
In the Eragon book series, the dwarves used the word "Werg" instead of "Ugh".

How to use
Use "Werg" instead of "Ugh" when talking.

Trivia
One dwarf city is humorously named Werghadn, which translatres as either "The Land of Ugh", or, more liberally, "The Ugly Land".