Man O'War!
I suspect it was in The Grass Is Always Greener episode.
Mrs. Brady took the boys fishing and Alice had to take the girls horseback riding.
Each lady took jabs at the other afterwards. Alice said Mrs. Brady smelled of fish.
Mrs. Brady said Alice smelled of Man O'War.
NOW! By chance, I read a piece in second grade about the jellyfish, Portuguese Man'o'War, so I knew the term.
And by chance, I had read in a Dennis the Menace comic book about Dennis bringing five pounds of 'steer manure' to Mr. Wilson's building a greenhouse for his flowers, so I was familiar with this terminology.
But even more, I knew about the smell of livestock as well.
What I did NOT know was there had been a racehorse named Man O'War, until I believe I just caught it on an episode of Frasier.
So for all this time, actually the last time I saw this episode of the Brady Bunch was probably twenty years ago or so, I thought Carol Brady's usage of "man o'war" was simply Florence Henderson's or someone else's attempt to 'soften up or polish' the word 'manure'.
"We can't say 'manure' on this family-friendly show, so let's go with some high society, la-de-dah term, man o'war, something Carol or Florence may have used.
Nevermind that I never heard it anywhere else, this was the Bradys.
Still seems rather dated for her to refer to a horse that had died twenty years earlier.