an expletive that replaces the word "fuck" popularized by the the updated SciFi channel show Battlestar Galactica
but originally used in the Battletech
novels possibly derived from the term "frackencrack" that was used as an expletive in the 1988 novel by Robert N. Charrette 'Wolves On The Border'. It appears in a later novel by Robert N. Charrette from 1989 'Heir To The Dragon' as simply "Frak".
"Frak!" Fuhito cursed aloud. A full lance of four 'Mechs. If the groundpounder's estimates of tonnages were correct, nothing less than a seventy-tonner.