Green’s Dictionary of Slang

falsies n.

1. [1940s+] pads placed in a brassiere that accentuate the shape and dimensions of otherwise diminutive female breasts.

2. [1940s+] (also falsie) anything fake added to a body, e.g. false eyelashes.

3. [1950s–60s] padding inserted in the trousers to resemble large genitals.

4. [1980s+] false teeth.