Definition of "gammon"

Toward the end of the game Roger had not borne off a single stone belonging to Roseanna, and she scored a gammon. She could not hide the triumph in her eyes. “Perhaps you will play a better game if we play for something closer to your heart,” she suggested.

2009 July 29, Virginia Henley, The Raven and the Rose, Island Books, page 210

We started about 7:00 drinking beers and playing gammon. Then after getting a little “loose” we went to a girls dorm.

2008 03, Zanzibar McFate, I Battled a Giant Otter: My Gut Bustin', Mutha Lovin' Life of Manly Adventure, iUniverse, page 131

“Gammon, Pen—go on,” Foker said.

1848 November – 1850 December, William Makepeace Thackeray, chapter 46, in The History of Pendennis. […], volumes (please specify |volume=I or II), London: Bradbury and Evans, […], published 1849–1850

He swore that all other religions were gammon, / And wore out his knees in the worship of Mammon.

1911, Ambrose Bierce, “Mammon”, in The Devil’s Dictionary, New York, N.Y., Washington, D.C.: The Neale Publishing Company

And no use for anyone to tell Charles that this was because the Family was in mourning for Mr Granville Darracott […]: Charles might only have been second footman at Darracott Place for a couple of months when that disaster occurred, but no one could gammon him into thinking that my lord cared a spangle for his heir.

1959, Georgette Heyer, chapter 1, in The Unknown Ajax

This blackfulla's driving a car. Copper stops 'im, says, “Did you know you were speeding?” Blackfulla says, “No.” His Missus goes, “Oh yeah you did, eh.” Cop says, “Did you know your tail lights aren't working? Guy says, "No". His missus says, "You did an' all, Dont you gammon to them coppers." Guy goes to his Missus, "Shut up!" Copper asks the Missus, "Does he always talk to you like that?" She goes, "Only when he's drunk!"

2016, Cathy McLennan, Saltwater