No swear words, please (sorry). It's for a YA fantasy that takes place on Skye (modern day), and has to be something a teenager might say (again, yeah, I know. Swearing. But surely there's something?).
CLARIFICATION: by "swear" I mean "four-letter-type curse words." I've had some people very concerned with semantics on another board point out (so helpfully) that "holy crap" and "Jesus Christ" ARE swear words. =/
Also, I'd like it to be uniquely Scottish. This is for a story, and it's meant to differentiate Scottish characters from American and Irish characters. So something universal that anyone would use as an exclamation won't serve to differentiate.