Definition of "gor"

By gor, den, we must needs now sing. Ding, ding, ading, Dinga, dinga, ding. For me am now at pleasures spring.

1878 , John Marston, “IACKE DRVMS Entertainement, or the Comedie of Pasqvil and Katherine”, in Richard Simpson, BA, editor, The School of Shakspere‎, page 190

Well, the last bishkit was sarved out, and by gor, the wather itself was all gone at last, and we passed the night mighty cowld.

c. 1832-1836, Samuel Lover, The Gridiron: Or, Paddy Mullowney's travels in France‎, page 9223

[…] "by Gor! You must stop dat dam racket! […] And, by Gor, none of you has de right to dat whale; […] .

1851, Herman Melville, Moby Dick, page 418

Oh Gor Almighty you be one good Gor Almighty, and dis nigga tankee you, and dis nigga promise to be one good nigga, and neber to cuss no more. Oh good Gor Almighty!

1858, George Lippard, The Quaker Soldier, Or, The British in Philadelphia: An Historical Novel‎, page 371

Gor Lumme! Now I've done it! That's too much, Blount."

1947, Cecil Day-Lewis (as Nicholas Blake), Minute for Murder‎

"Gor,Blimey," Burns curses, looking over his shoulder at his boss, "Here's what they've been hiding, Sir."

2015, Eddie Robbert, Heads Win, Tail Lose‎, page 96