What does "chicken fillet" mean?

A piece of rubber or silicone placed in a woman's bra under the breast to increase apparent size or create more cleavage.

What is a synonym for "chicken fillet"?

Common synonyms include: falsie, outplant.

noun, slang

noun, slang ·Uncommon ·College level

Noun

1
A piece of rubber or silicone placed in a woman's bra under the breast to increase apparent size or create more cleavage. slang
"[…] to wear a bikini this year, to enjoy the season without fearing that my chicken fillets are going to fall out every time I jump in a pool."
2
Used other than figuratively or idiomatically: A piece of chicken breast meat.

"[…] to wear a bikini this year, to enjoy the season without fearing that my chicken fillets are going to fall out every time I jump in a pool."

From the texture and shape of the silicone outplant.