E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Greenlandmans Galley.
The lowest type of profanity and vulgarity.
1
In my seafaring days the Greenland sailors were notorious for daring and their disrespect of speech, prefacing or ending every sentence with an oath, or some indecent expression. Even in those days [the first quarter of the nineteenth century] a Greenlandmans Galley was proverbially the lowest in the scale of vulgarity.C. Thomson: Autobiography, p. 118.
Too low for even a Greenlandmans Galley. One whose ideas of decency were degraded below even that of a Greenland crew.