E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The lowest type of profanity and vulgarity.
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.