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Green’s Dictionary of Slang

mast n.

the (erect) penis.

1669		Life and death of Damaris Page 4: There many a Seaman hath sat with his Doxy / [...] /Boarding of Friggots, until at the last / Lights of a fire-ship, and so spoyls his Mast.
[1741		‘Capt. Samuel Cock’ Voyage to Lethe 13: I took Possession of the Charming Sally and immediately fell to work upon her. The Main-Mast being a Long-side, we strove to heave it in [...] by greasing and working it to and fro [...] it went tolerably plumb into the Socket].
1798		‘Botany Bay’ in Hilaria 18: Tho’ shook by the stroke, Adam’s mast stood upright / His ballast was steady, his tackling quite tight.
1836		‘The Soldier’s Bayonet’ in Gentleman’s Private Songster in Spedding & Watt (eds) Bawdy Songbooks (2011) III 368: Then they lay me on the ground, / And thrust me through and through, / [...] / The Sailor with his main-mast, / Bores away so strong.
c.1850		Peeping Tom (London) 30 120/2: [a toast] ‘May we never want a standing mast in the Chops of the Channel’.
c.1900		‘Ramrod’ Nocturnal Meeting 58: His prick surging and thickening until I thought a regular mast was presing against me.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Mast. Penis especially when erect.

In phrases

(at) half-mast (adv.)

in a partially lowered position, used esp. of trousers or a partial erection of the penis.

1914		Sport (Adelaide) 4 Sept. 5/4: Freddy’s trousers were flying half-mast on Saturday night.
1940		L.A.G. Strong Sun on Water 139: Horsa, with his trousers at half-mast .
1951		D.W. Cory Homosexual in America 112: The passive pederast, caught in the act, has his jeans at half mast.
1964		N.B. Harvey Any Old Dollars, Mister? 80: Her bloomers were half-mast.
1972		(ref. to early 1950s) B. Rodgers Queens’ Vernacular 117: jeans at half mast (early ’50s) pants lowered below the ass for sexual purposes.
1972		R.A. Wilson Playboy’s Book of Forbidden Words 134: Half-Mast. An incomplete erection.
1977		A. Bleasdale Who’s Been Sleeping in my Bed 68: I thought of the inside of her mouth an’ me flag fell to half mast.
1988		‘Victoria Parker’ Incest Schoolgirls 🌐 His cock was at half-mast, then the shaft started to thump to an amazing erection in his slacks.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 67: Jerry’s eyes were at half-mast.
2002		D.H. Sterry Chicken (2003) 23: My eyes [...] go half-mast as if the president has died inside my head.
2011		J.J. DeCeglie Drawing Dead [ebook] I stood there watching over her, half-mast, and only needing a whiff to set sail.
		T. Pluck ‘Story of O Street’ in Life During Wartime (2018) 59: ‘Who you kidding, Mary? Your flag’s way past half mast!’.