Maybe a KIDNEY.
You already have his testicles.
The Big Bang Theory Season 11, Episode 9
Well, I never told you
about my brother's KIDNEY stone.
The Big Bang Theory Season 7, Episode 11
...oyster, KIDNEY bean and grape.
The Big Bang Theory Season 3, Episode 17
Sure I can't get you a bit more KIDNEY pie?
Game of Thrones Season 4, Episode 7
Kidney? Cornea? Piece of his liver?
The Big Bang Theory Season 8, Episode 20