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Frak or frack is a fictional version of "fuck" first used in the 1978-Battlestar Galactica television series. It continues to be used throughout different versions of the Battlestar Galactica franchise as a profanity in science fiction.
There are other uses, however: companies have adopted it as the name for commercial products, notably a computer game. It has also appeared in other television shows, including Eureka, The Big Bang Theory, Veronica Mars, 21 Jump Street, Better Off Ted, Warehouse 13, Chuck, 30 Rock, Babylon 5, Buffy Comics, Transformers: Prime, Castle, Space Ghost Coast To Coast, Helix, Dollhouse, Bones, The Flash, Arrow and Betas. It has also been used in the 2012 video game Transformers: Fall of Cybertron and Robot Chicken had a sketch on its "Rabbits on a Roller Coaster" episode parodying the reimagined 2004-Battlestar Galactica and its use of frak.
"Frak" is a fictional censored version of "fuck" first used in the 1978 Battlestar Galactica series (with the spelling "frack"). In the "re-imagined" version, and subsequently in Caprica, it appears with greater frequency and with the revised spelling "frak", as the producers wanted to make it a four-letter word. In that framework it seems to function as a substitute for "fuck" in several different forms.
"Frak!" was the title of a popular game released on the BBC Micro B and Acorn Electron in 1984, and later the Commodore 64. The game saw the user controlling a caveman called Trogg, who had to navigate various maze-like scenarios and dispose of various deadly obstacles with his yo-yo. When coming into contact with such an obstacle or falling a substantial distance, Trogg would cry "Frak!" (via a speech balloon that appeared over his head) before the user restarting the level.
"Frak" is used in the same sense as in Battlestar by characters in the early 21st century "Ciaphas Cain" series of Games Workshop Warhammer 40,000 novels by Sandy Mitchell, probably an expression from the character's unknown birth world.
The word is also a direct Battlestar Galactica reference in the Periphery song "Frak the Gods".