ball splitter
A strap in a chastity cage or piece of clothing that goes between the testicles, splitting them and making them bulge out.
Correct examples
- Danbooru post #4477838 NSFW | A ball splitter of a chastity cage.
- Danbooru post #6123644 NSFW | Ball splitting panties.
Incorrect examples
- Danbooru post #7546267 NSFW | Testicles partially covered by panties.