These days it has come to mean the aircrew onboard ship. However, it comes from the use of "blue unction" the Navy used to cure a dose of the crabs and was exactly the same colour as the RAF uniforms. RAF personnel can also be known as crabs.
By SailingQuiz September 2019 Category: Nautical Saying
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What does Crabfat mean?
What is the nautical origin of the phrase "Crabfat"?
Definition of the nautical phrase "Crabfat".