Green’s Dictionary of Slang

meg n.1

also megg
[generic uses of mag n.3 ]

1. a guinea.

[UK]T. Shadwell Squire of Alsatia I i: Prithee, noble squire, equip me with a couple of megs, or two couple of smelts.
[UK]B.E. Dict. Canting Crew n.p.: Meggs c. Guineas. We fork’d the rum Cull’s Meggs to the tune of Fifty, c. We Pickt the Gentleman’s Pocket of full Fourty Guineas.
[UK]N. Ward Compleat and Humorous Account of Remarkable Clubs (1756) 228: Then on with your Night-Caps and tie up your Legs, / A Begging let’s go for the Smelts and the Megs.
[UK]A. Smith Lives of Most Notorious Highway-men, etc. (1926) II [as cit. c.1698].
[UK]New Canting Dict. [as cit. c.1698].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
[UK]B.M. Carew Life and Adventures.
[UK]Grose Classical Dict. of the Vulgar Tongue n.p.: Meggs, guineas, (cant).
[UK]Hotten Dict. of Modern Sl. etc. 61: meggs were formerly guineas.
[UK]Hotten Dict. of Modern Sl. etc. [as cit. 1859].

2. (US) a silver coin, from ten cents (a dime) to a dollar.

[US]Spokane Press (WA) 22 Sept. 7/3: The best draw made [...] was thirty megs (dollars).
[US]R. Lardner ‘Three Kings and a Pair’ in Gullible’s Travels 62: Some doll she was, too, in a fifty-meg evenin’ dress marked down to thirty-seven.
[US]Maines & Grant Wise-crack Dict. 11/1: Meg – Any denomination of silver money between ten cents and one dollar, signified by fifteen megs, twenty megs, etc.
[US]W.T. Vollmann You Bright and Risen Angels (1988) 314: Here’s how we clean out their cush, their C-notes and megs, their deemers and crisp green bumblebees.

3. (US) a cent.

[US]Morn. Tulsa Dly World (OK) 13 June 19/3: Meg — A penny.
A. Baer [no title] 10 Aug. [synd. col.] Hot dogs are up to ten megs apiece.
A. Baer Says ’Bugs’ Baer 15 Nov. [synd. col.] Admission will be from fifty megs to a dollar.

4. see mag n.3