Grockles
Wikipaedia did slightly better, though they list it as being Weymouth and Portland in usage (and the definition was correct-ish) and it's found across more of Dorset than that.
So, where do you live, and do you know what a 'grockle' is? The answer is, of course, a tourist. It isn't particularly a derogatory term (though perhaps slightly dismissive), it's just people who come here for their holidays - non-locals.

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Three or four years ago it was used in a University Challenge question which asked for the equivalent term in Cornwall.
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Martin Nicholas, a minister who used to be at the United Reformed Church in Weymouth, wrote a wonderful song called "Grockle Rock".
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(Anonymous) 2006-01-13 05:08 pm (UTC)(link)no subject
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Gina
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One flatmate has a Devon Dialect ditionary, and this describes a 'grockle' as a visitor to Devon. I thought it was peculiar to Devon, but it's obviously spread along the south coast.