An arrogant upper/upper-middle class lady or gent, typically a student in an otherwise charming Scottish town or city.
Girls = flowing 'blonde' hair, pink pashmina, ironically kitsch little bag, astounding ignorance, charming high-pitched giggle.
Guys = floppy birds' nest-esque hair, woollen jumpers, suspiciously tanned, exceptionally loud and annoying voice which will usually be spouting some kind of patronising ex-public-schoolboy wit.
Possibly originating from their judicious use of 'yah, darling, yah' in general conversation.
Kill the yahs!
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