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(obsolete, nautical) A type of gruel made from oatmeal, oft-served historically in poorhouses, sailors' ships, etc. quotations
Breakfast was served at 8am and sometimes consisted of skillygalee, a sort of oatmeal gruel prepared in fatty water and which by the time of Trafalgar included butter and sugar.
2005, Gregory Fremont-Barnes, Steve Noon, Nelson's Sailors, Osprey Publishing, page 24
(obsolete) A thin broth generally prepared by soaking hardtack in water, and frying with pork fat/lard. quotations
Skillygalee was born of left-over pork grease and crackers too tough to bite and chew.
2004, Brian Leehan, Pale Horse at Plum Run: The First Minnesota at Gettysburg, Minnesota Historical Society Press, page 200