’sniggers!, excl. — Green’s Dictionary of Slang

’sniggers! excl.

also niggers! niggers noggers! ’snigs! udsnigs!

[meaning of nigs unknown]

a general oath, lit. ‘God’s nigs’.

1633		Rowley Match at Midnight I i: These wicked Elder Brothers, that sweare refuse them, and drink nothing but wicked Sacke, when we sweare nothing but niggers noggers, make a meal out of a bloate Herring, water it with four shillings Beere, and then sweare wee have dined as well as my Lord Master [...] Niggers noggers, I thought he had bene sicke. [Ibid.] I i: Sniggers, what does the Divell and a Saint both in a signe? [Ibid.] II i: Niggers I haue read of her in the Mirrour of Knighthood.
c.1635		W. Cartwright Ordinary III ii: ’Snigs, another! / A very perillous head, a dangerous brain!
1656		in Ebsworth Choyce Drollery (1876) 59: U’ds nigs dost think that paper will / Keep warme my back and belly fill?
1675		C. Cotton Scoffer Scoff’d (1765) 204: S’nigs, well remembred! I’le be gone.
1677		R. L’Estrange Counterfeit Bridegroom II i: Niggers noggers, what ailes the Widow [...] Niggers, Sir, why don’t you budge?
1700		M. Pix Beau Defeated IV ii: Why he is my Master, Udsnigs!
1719		in D’Urfey Pills to Purge Melancholy IV 96: Uds nigs quoth I, what a Kirk beth’ here.
c.1850		Peeping Tom (London) 17 67/2: Uds niggers noggers, what a sight is here!

In exclamations

I’m sniggered! (also I’ll be snickered!)

a general oath; basically a euph. for I’ll be damned!

1827		Bell’s Life in London 23 Sept. n.p.: [pic. caption] ‘I say, Bill, I’ve got his ticker; pull his precious nob off!’ ‘I’m sniggered if I don’t!’.
1831		‘Gallery of 140 Comicalities’ Bell’s Life in London 24 June 2/2: I know vots vot, and I’m snigger’d if I don’t come the ‘chirp’ – I harn’t had my ‘regglers’ for the last two ‘cracks,’ and hates vots dishonourable.
c.1838		G.W.M. Reynolds ‘House Breaker’s Song’ in Farmer Musa Pedestris (1896) 123: For I’m snigger’d if we will be trepanned / By the blarneying jaw of a knowing hand.
1860		Hotten Dict. of Modern Sl. etc. (2nd edn) 221: ‘I’m sniggered if you will,’ a mild form of swearing.
1864, 1867, 1870		Hotten Sl. Dict.
1908		L.W. Payne Jr ‘Word-List From East Alabama’ in DN III:iv 290: be snickered, v. phr. Used as an exclamation of surprise. ‘Well, I’ll be snickered!’.

jimming-snigs!

a general oath.

1831

Satirist (London) 28 Aug. 163/2: But, Jimming-snigs! my dear Sat, what a deal of life one does see tumble up in this here veal (that 's the French for city).