Green’s Dictionary of Slang

1. a cuckold; thus cuckquean, a female cuckold.

1546		J. Heywood Proverbs II Ch. vi: You make her a cockqueyn and consume her good.
1601		W. Percy [play title] The cuck-queanes and cuckolds errants or The bearing down the inne.
1609		Shakespeare Troilus & Cressida scene 24: The cuck-old and the cuck-old-maker are at it.
c.1629		R. Brome City Wit IV i: Marry to bee made a Cuckqueane by such a Coxcombe.
1680		Merry Maid of Islington 17: Fear not that, good Cuckquean.
1705–07		N. Ward Hudibras Redivivus I:10 12: Not the Horn-Plague, but something worse, / Had drove the frighted Cucks from thence.
2024		J. Meades Empty Wigs (t/s) 592: She was not the sort of wife who was willing to overlook being deceived, she did not want to be made a cuckquean.
2024		C. Stella Joey Piss Pot 87: ‘Imagine, a macho man like yourself staying married to a woman who fucks a guy in his crew and anybody else who winks at her? Seriously, Carmine, you really are a cuck’.

2. (US) in incel use, a second-rate male who fails to establish a relationship with the pick of, or (possibly any) females.

2021		K. Preston et al.‘The Black Pill’ in Men & Masculinities 18 May 🌐 They identify Chads as the most attractive type of men, followed by normies (or ‘cucks,’ ‘betamales,’ or ‘numales’), and then incels.
2023		X 9 Dec. 🌐 All you calling for a ceasefire are cucks & useful idiots who’ve been completely manipulated by Islamic fundamentalist rapists who want to destroy you.