Klingon (language)
From Tardis Wiki, the free Doctor Who reference
One of the women in Howie Spragg's room on the prison ship which held the Minotaur mockingly asked Howie, "What's 'loser' in K-K-K-Klingon?" (TV: The God Complex)
Behind the scenes
Though The God Complex doesn't make a direct connection, this is an obvious reference to the language of the Klingons, a race from the Federation universe in Doctor Who related media as well as other media in the Star Trek franchise which falls outside what this wiki covers.
