A reactionary exclamation to something or someone you don't agree with. Medway in Kent based particularly the Strood area.
The sort of thing you'd say walking away from someone, rather than something to say to get a reaction. Said with the emphasis on the word gurnet.
Q. Its your turn to to make the tea?
A. Why don't you suck on my old gurnet
(Bad example but couldn't think of a good one, lol)
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