Green’s Dictionary of Slang

falsies n.

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

[US]I. Shulman Cry Tough! 173: ‘Mitch,’ he said as he leaned toward Iris [...] and grasped a breast, ‘this babe is stacked.’ Mitch smiled. ‘No falsies?’.
[US]J. Weidman Price Is Right 187: Montgomery Ward also sells what I think are known as falsies.
[US]A. Childress Like One of the Family 66: Since I’m a wee bit flat-chested, I’m supposed to buy ‘falsies’.
[Aus]‘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.
[UK]G. Freeman Undergrowth of Lit. (1969) 143: Cloth falsies, concealed in the dress, complete the deception.
J Susann Love Machine 14: She adjusted the falsies in her bra, then checked her makeup.
[US](con. 1940s) E. Thompson Tattoo (1977) 143: Hey! [...] This bitch wears falsies! She ain’t got titty-one!
[US]H. Rawson Dict. of Invective (1991) 77: cheaters, which can refer to [...] falsies or other padding for deceptively enhancing one’s physical attributes.
[SA]J. Naidoo Coolie Location 62: One day he brushed past her and swore that they were genuine: ‘Nah, that cherrie doesn’t need falsies’.
[UK]Guardian Guide 4-10 Sept. 36: Their resplendant falsies, mad make-up.
[UK]Indep. Rev. 29 June 7: Now I have two very neat lambswool falsies. I rather like them.
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.

[US]H.A. Smith Rhubarb 131: He wears a falsie.
[US]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.
[US]C. Clausen I Love You Honey, But the Season’s Over 107: How to make falsies look real.
[UK]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.
[UK]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. padding inserted in the trousers to resemble large genitals.

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

4. false teeth.

[Aus]T. Winton That Eye, The Sky 102: Taking the Michael out of his girlfriend for being ugly and dropping her falsies in the washing.
[UK]K. Lette Foetal Attraction (1994) 102: Come on, Gillian. Are you really going to tongue-kiss a bloke with falsies?