Balls of increasing size evenly spaced on a string that you tuck away in your (or your partner's) anus. Then, right when you're about to orgasm, and not a moment before, you gently pull the string thereby releasing the balls uno by uno. Benoit balls come in plastic and metal, from petite to gi-normous.
Unknown to many god-fearing housewives, grapes are the benoit balls of choice for sodomites.
The nickname given to a hotel concierge named Benoit in "Jeu Monégasque," a season 2 episode of the FX show, "Archer."
Also: misspelling of Ben Wa Balls.
Archer: "Sounds like 'Ben Wa Balls,' Benoit... Balls. See? You can't even say it without saying 'Balls.'"
Archer: "Hang on! Benoit Balls!"