Recently I've been reading the novel "The Wee Free Men" by Terry Pratchett, which tells about a funny folk of pixies (or, pictsies) called the Nac Mac Feegle. In the book they speak, or at least are supposed to speak, Scottish English (I can't judge the authenticity of the language). It was quite funny to try and extract the meaning from their talks and guess what means what.
I had only one major problem - the creatures use the word "Crivens" very often as some kind of swearword or interjection. I couldn't help wondering if this is some real ScE word, or maybe some word intentionally misspelled (to emphasise different pronunciation), or is it simply the author's invention.
OK, I have to admit - if it proves authentic I plan to add it to my active English vocabulary for good