Saw this online at my local NPR station’s website. Apparently the apostrophe lost its way and wandered over to the wrong word. The names were blurred to protect the guilty. Also because I’m embarrassed for them.
My mom used to intentionally mangle this phrase for comic effect, calling it “horses’ d’ovaries” and (when we were older) “whore’s d’ovaries” but I never dreamed I’d actually see it in print one day.