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Music that is extremely unpleasant on the ears, causing intense displeasure and shouldn't be described as real music i.e. Nickleback. A portmanteau of the adjective British slang usage of gash, meaning something rubbish, worthless or very bad and the suffix "-core" derived from the word hardcore, used here to add extremism. It is satire of the overuse of -core to create new musical sub-genres.
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