Green’s Dictionary of Slang

mount v.¹

to have sexual intercourse with, spec. to climb on, prior to sexual intercourse.

c.1592		Shakespeare Venus and Adonis line 596: Now she is in the very lists of love, Her champion mounted for the hot encounter.
1608		Machin & Markham Dumbe Knight I i: Well sir, I may go or so, but would my mistresse take a standing of my preferment, I would so mount her, shee should loue strange things the better all her life after.
1614		N. Breton I Would and Would not I in Grosart (1879) 6/1: I would I were a Cuckold Wittall Asse, And car’d not who did mount my Hackney Saddle.
1629		Jonson New Inn I i: To play sir Pandarus, my copy hath it [...] To mount the chambermaid.
a.1653		‘The Colchester Quaker’s Complaint’ in Ebsworth Merry Drollery Compleat (1875) 57: A scandall ’twill be counted, / When ’tis talk’t with disdain, / Amongst the profane, / How Brother Green was mounted.
a.1661		‘The Four-legg’d Quaker’ Rump Poems and Songs (1662) I 358: He caught a Foal and mounted her / (O base!) below the Crupper.
1668		Etherege She Would if She Cou’d III iii: She’s so bonny and brisk, / How she’d carvet and frisk, / If a man were once mounted upon her!
1698		N. Ward ‘A Trip to Jamaica’ Writings (1704) 147: The Jilt [...] for her Security, makes her Rider Pay for his Journey, before he mounts the Saddle.
1715		A. Pennecuik Poems (1815) 363: To see old Cuff upon young Helen mounted [F&H].
1734		C. Johnson Hist. of Highwaymen &c. 143: I must alight, and mount thy alluring Body, to the End I may come in unto you.
1768		Gentleman’s Bottle-Companion 13: The wish of the sportsman shall first be recounted, / Like him, each fair lady loves well to be mounted.
1787		Harris’s List of Covent-Garden Ladies 49: Her price for either mounting or being mounted is one pound one.
1791		Essay on the Art of Strangling 7: Mounting men, unaccustomed to hard riding [...] urge them to drive on at so unconscionable a rate.
1838		‘Mounting a Maid’ Rambler’s Flash Songster 30: She took his pipe then in her hand, / Another tune to make him stand, [...] When he mounted again the mounting maid.
1843		Satirist & Sporting Chron. (Sydney) 4 Mar. 3/4: [He] will only mount his Mare to have a ride — he refuses to mar-r-y her.
1845		T. Rowlandson Pretty Little Games (1872) plate vi: Well mounted on a mettled steed, / Famed for his strength as well as speed, / Corinna and her favourite buck / Are pleased to have a flying f—k.
1850		Man of Pleasure’s Illus. Pocket-book n.p.: [B]eing an old trooper herself, she under- takes the art of mounting, which she teaches with considerable success, and is rough-rider in her own establishment.
1888–94		‘Walter’ My Secret Life (1966) I 46: I see now plainly enough that, boy as I was, she wanted me to mount her.
1904		Lustful Memoirs of a Young and Passionated Girl 62: I placed myself on my back expecting him to mount me at once but he wished to examine the premises first.
1961		(con. 1952) in Randolph & Legman Ozark Folksongs and Folklore (1992) II 644: If all the young ladies were mares in a stable, / And I were a groom mounting all I were able.
1972		J.B. Keane Letters of Irish Parish Priest 7: He administered a half-hearted slap to the girl’s bare buttocks – I recall what he said: ‘Get moving or get mounted, your posterior has me intoxicated’.
1989		P. Munro Sl. U.

In phrases

mount a corporal and (a) four (v.) [‘the thumb is the corporal, the four fingers the privates’ (Grose, 1785)]

to masturbate.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Corporal, to mount a corporal and four; to be guilty of onanism: the thumb is the corporal, the four fingers the privates.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.

SE in slang uses

In phrases

mount the ass (v.) [old Fr. custom of exhibiting a bankrupt riding backwards on a donkey]

to become bankrupt.

1890–1904

Farmer & Henley Sl. and Its Analogues.

mount the ladder (v.) [the ladder onto the gallows]

to be hanged.

1685		S. Wesley Maggots 154: Who Mounts the Bridal Bed is madder / By far, than him that Mounts the Ladder. / What Man in’s Wits wo’n’t rather chuse / The Hempen, than the Marriage Noose?
1734		C. Johnson Hist. of Highwaymen &c. 70: He mounted the Ladder with Good Grace.
1859		Matsell Vocabulum 49: ‘He mounted the ladder,’ he was hung.
1895		C. Crowe Aus. Sl. Dict. 43: Ladder, the gallows’ steps,‘he mounted the ladder,’ hanged.