(CAMBRIDGE), A certificate from the apothecary that you are indisposed, (i. e.) to go to chapel. He sports an Ægrotat, he is sick, and unable to attend Chapel, or Hall. It does not follow, however, but that he can Strum a piece, or sport a pair of oars.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Adrift * Affidavit MenNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes