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Green’s Dictionary of Slang

blow-through n.

[SE blow through, the process of blowing steam through the cylinder of an engine etc, to clear it of air]

an act of sexual intercourse.

1909		G.R. Bacchus Pleasure Bound ‘Ashore’ 69: He had had a ‘blow-through’ with one of the Sisters Lovett.
1957		K. Amis letter 19 Feb. in Leader (2000) 505: Wouldn’t give a pinch of shit for his chances of even an occasional blow-through.
1958		(con. 1940s) B. Behan Borstal Boy 175: For his morning blow-through.
1971		(con. WWII) B. Aldiss Soldier Erect 132: She was good enough for a blow-through.
1984		(con. WW2) T. Jones Heart of Oak [ebook] The next place we called at was Aden, / The girls wouldn’t fuck but we made ’em; / Ten dollars I’d pay for a blowthrough each way [etc.].

In phrases

have a blow-through (v.)

to have sexual intercourse.

1937–84		Partridge DSUE (1984) 100: C.20.
2002		‘MommaKin’ EliteFitness.com Forum 25 Jan. 🌐 have a bit on the fork / have a blow through / have a brush with the cue.