Brandi Glanville to Joanna Krupa -- This Fish Remind You of Anything? (Yes, I Mean Your Vagina)

Brandi Glanville humiliated her nemesis Joanna Krupa during a fancy L.A. dinner ... by putting a new twist on their stinky vagina war.

Sources at celeb hot spot Craig's tell us the feuding housewives were dining at separate tables last Friday ... when Brandi uncorked a brilliant, yet smelly prank.

We're told Brandi sent a plate of steaming hot salmon over to Joanna, and the stunt was a not-so-subtle response to Krupa's defamation lawsuit over Brandi's original lady parts insult.

Joanna was with her husband, Romain Zago, and we're told they were both upset by the rank (yet most likely tasty) joke ... but left with no issues.