Green’s Dictionary of Slang

1. pads placed in a brassiere that accentuate the shape and dimensions of otherwise diminutive female breasts.

1945		E. Wilson I Am Gazing Into My 8-Ball 34: Mae West’s famous Mae Wests are really falsies.
1950		J. Weidman Price Is Right 187: Montgomery Ward also sells what I think are known as falsies.
1956		A. Childress Like One of the Family 66: Since I’m a wee bit flat-chested, I’m supposed to buy ‘falsies’.
1963		‘Geoffrey Tolhurst’ Flat 4 King’s Cross (1966) 16: One of the first things I was going to do, I thought, was to get myself a whale of a high blonde hairdo, and maybe a pair of falsies.
1967		G. Freeman Undergrowth of Lit. (1969) 143: Cloth falsies, concealed in the dress, complete the deception.
1969		J Susann Love Machine 14: She adjusted the falsies in her bra, then checked her makeup.
1974		(con. 1940s) E. Thompson Tattoo (1977) 143: Hey! [...] This bitch wears falsies! She ain’t got titty-one!
1989		H. Rawson Dict. of Invective (1991) 77: cheaters, which can refer to [...] falsies or other padding for deceptively enhancing one’s physical attributes.
1990		J. Naidoo Coolie Location 62: One day he brushed past her and swore that they were genuine: ‘Nah, that cherrie doesn’t need falsies’.
1999		Guardian Guide 4-10 Sept. 36: Their resplendant falsies, mad make-up.
2001		Indep. Rev. 29 June 7: Now I have two very neat lambswool falsies. I rather like them.
2004		J. Canfield et al. Chicken Soup for the Girlfriend’s Soul 19: Once in the bedroom, I tried on my bathing suit with the falsies in place.

2. (also falsie) anything fake added to a body, e.g. false eyelashes.

1946		H.A. Smith Rhubarb 131: He wears a falsie.
1957		R. Prather Always Leave ’Em Dying 117: You also forget they aren’t going to get away with it, since if they try, to-morrow at three o’clock I shall be right there in the thick of things, yanking off falsies or whatever, and raising all kinds of hell.
1962		C. Clausen I Love You Honey, But the Season’s Over 107: How to make falsies look real.
1971		New Scientist 7 Jan. 5: Those pretenders who stick on their crowning glory with adhesive can be recognised in overheated carriages when the temperature raises itchy hell under their head-falsies.
2003		N. Griffiths Stump 111: Anyway thee gave her a falsie, y’know, like a glass one [i.e. eye]. [Ibid.] 211: This one-armed feller; he’s probly wearin a falsie, inny? One a them false limbs, like.

3. false teeth.

1953		E. Wilson Look Who’s Abroad Now 23: Jim indicated his diamond cane, diamond glasses, diamond zipper, and diamond teeth—‘falsies’ which he wears for show.
1986		T. Winton That Eye, The Sky 102: Taking the Michael out of his girlfriend for being ugly and dropping her falsies in the washing.
1993		K. Lette Foetal Attraction (1994) 102: Come on, Gillian. Are you really going to tongue-kiss a bloke with falsies?

4. padding inserted in the trousers to resemble large genitals.

1959		W. Burroughs Naked Lunch (1968) 157: They all wear enormous falsie baskets.
1966		Trimble 5000 Adult Sex Words and Phrases.