one off

The only time I've ever heard "one off" is in the context of "one off the mark"...you're just one off. I spent a lot of time with Brit friends (one a fellow mate on a tour boat for a whole summer), and others in the entertainment field, and I don't remember one-off ever coming up, because I'm sure I would have asked about it as I would any new expression or idiom...curious.

black humor Enjoyed your little tale, Fiberbabe! And if, as you say, black humor is your favorite, I hereby command you to go out and rent "Black Adder's Christmas" immediately (if you haven't seen it ), 'cause 'tis the season!