Skor is a Tauron word, a more vulgar term for the word "crap." It can be used as an exclamation or a noun.
While spending time in Little Tauron with his nephew, Willie, Sam Adama points out a car and says, "Nice car. Looks like skor, but it's got 350 under the hood, a triple-mounted clutch, which most knuckleheads will tell you is a bad thing." ("Rebirth")