Green’s Dictionary of Slang

rammer n.

1. (also cunt-rammer) the penis.

[UK] ‘Seven Merry Wives’ in Pepys Ballads (1987) V 413: [He] has but one Stone, And besides, the worst Rammer as ever was known.
[UK]‘Roger Ranger’ Covent Garden Jester 20: Cast off all the tackling about the breech [...] that uncovers the touch hole. Next get the breech down upon the bed, then you have the muzzle high enough for close work [...] lastly take your rammer in your hand, thrust home, discharge, that completes the business for the present, till you are ready to fire again.
[Ire] ‘The Gobbio’ Chap Book Songs 7: He rammed his charge with a rammer of length / Have a care said he, there, there, said she.
[UK]‘The Soldier’s Bayonet’ in Gentleman’s Private Songster in Spedding & Watt (eds) Bawdy Songbooks (2011) III 368: And when he’s in the battle, / To which glory loudly calls, / I’ll shove his rammer tighter in, / And take care of his balls!
[UK]‘Walter’ My Secret Life (1966) VII 1313: Taking her gloved hand, I put it round it. How smooth the kid felt to my sensitive rammer. [Ibid.] 1321: Up she got, leaving me on the sofa, with my pulsating, crimson tipped, cunt-rammer out.
[US]B. Rodgers Queens’ Vernacular.

2. (UK Und.) the arm.

[UK]Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Rammer the Arm (cant). The Busnappers kenchin seized my Rammer. i.e. the Watchman laid hold of my arm.
[UK]Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: Rammer. The arm. The busnapper’s kenchin seized my rammer; i.e. the watchman laid hold of my arm. Cant.
[UK]Lex. Balatronicum [as cit. 1788].
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[US]Matsell Vocabulum 72: ‘The cooper seized my rammer, and run me like a prad to the wit,’ the officer laid hold of my arm, and ran me like a horse to prison.
[US] ‘Jargon of the Und.’ in DN V 460: Rammer, The arm.
[US]Monteleone Criminal Sl. (rev. edn).

3. the leg.

[UK]A. Mayhew Paved with Gold 189: The first round was soon terminated, for Jack got a ‘cracker on his nut’ which knocked his ‘rammers’ from under him.

4. (US gay) an enthusiastic, energetic copulator.

[US]B. Rodgers Queens’ Vernacular 90: men who fuck hard and fast [...] rammer.