Gave two talks to Year 12 students on Friday with the title 'English Language at University'

Response was quite mixed at the time, with one group much more lively and interested than the other, but spies in the corridor said my session was described as 'proper good'.

I had a problem being understood when I quoted students in the tea break saying that 'bourbons are butters'** and that jammie dodgers are 'not too shabby' but I'm still not sure whether my leg was being pulled when one group told me they'd never heard the word 'chav'. One member of the group suggested that it was a word that just 'hasn't reached that part of London' yet. Is this possible?

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** 'butters' means ugly/nasty/disgusting, originally from 'butt ugly', I believe