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Goosnargh," said Ford Prefect, which was a special Betelgeusian word he used when he knew he should say something but didn't know what it should be.

Douglas Adams (2009). “So Long, and Thanks for All the Fish”, p.23, Pan Macmillan
Goosnargh, said Ford Prefect, which was a special Betelgeusian word he used when he knew he should say something but didn't know what it should be.