Frak
From Battlestar Wiki, the free, open content Battlestar Galactica encyclopedia and episode guide
Definition
Frak is an expletive analogous to the English word fuck.
Usage
It is used much like its English counterpart, i.e. "Frakkin' rats."/"Fuckin' rats."
It is a multipurpose and adaptable term, for it is capable of being used as a term describing the act of sex (ex: Tyrol's just fraked Sharon!) or can be used to denote one's hatred of something (ex: Frakin' Cylons).
In the original series, it was spelled "frack".