What about flukorum? It’s been a loooong time ago but I did pass the Latin regents.
Flukorum is indeed the genitive plural form of a feminine noun. If one had a pet fluke, flukorum would be like "the fluke's fat hips".
I assumed it was a verb, so: I fluke, you fluke, she flukes, we fluke, you all fluke, and they all fluke all the time mostly.