Green’s Dictionary of Slang

an impotent old man.

[1654		New Brawle 5: [A] suck-egg, a askall [...] one who would rob a Hen-roost, rather than pleasure a Wife. Such feeble do-littles makes so many honest Women goe astray].
1748		Spy on Mother Midnight II 39: Sir Domine praying very devotedly for Success to the Undertaking.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1826		Vulgarities of Speech Corrected.