Green’s Dictionary of Slang

1. a large (old) woman.

1865		Leaves from Diary of Celebrated Burglar 155/2: There I stood, beside the unwieldy old barge, who never even attempted to apologise for the pain she was the means of me enduring.
1904		Sun. Times (Perth) 4 Sept. 4/7: Her Buxomness [...] the barge-built lady.
1909		J. Ware Passing Eng. of the Victorian Era 33/1: Black-silk Barges (Ball-room) Stout women who ought to avoid dances.
1983		R. Price Breaks 405: ‘Pete’s mom was almost as big as me . . .’ Jack swallowed a belch [...] ‘Yeah, she was a real barge.’.

2. (US) a large foot [note Dict. Americanisms (1951): ‘barge N. Eng. a large omnibus or pleasure vehicle’].

1960, 1967–8

in DARE.

3. a particularly large vagina.

1966		Trimble 5000 Adult Sex Words and Phrases.
1972		‘Honey Babe’ in R.A. Wilson Playboy’s Book of Forbidden Words 28: I never saw a girl so large, / She had a cunt like a landing barge.
1983		R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].

4. (US black) a large car, esp. a Cadillac.

1968		‘Sl. of Watts’ in Current Sl. III:2.
1972		B. Rodgers Queens’ Vernacular 212: If this large car is difficult to handle in traffic, it is cursed out as a Cleopatra’s barge or simply a barge (camp).
1995		J. Stahl Permanent Midnight 163: Big G’s bust-out ’76 Bonneville, a rusted baby blue barge.
1999		Indep. Mag. 17 July 51: Volvo’s S80 has turned out to be, frankly, a bit of a barge.

5. (US gay) a large, poss. elderly, male prostitute’s client.

1994

G. Indiana Rent Boy 43: The big barge pulling in to get serviced after a gruelling day of kissing ass in the office cubicle. And the johns love to talk.