Note: A tlumnph is a metal plate about the size of a fobott'r hand upon which has been etched an individual's geneology. Tlumnphs have great personal significance, and many fobott'r will make a pilgrimage to the vaults of Tetnumbrathi, on Gripp, to cast their tlumnphs in among the trillions already there.
"Tlumnphrot" is what happens when a fobott'r uses poor quality metals to make their tlumnph, and their life's record corrodes. Fobott'r are far too careful for tlumnphrot to actually be a thing that happens, but the thought alone is offensive enough to make it a powerful epithet
Addendum to Note: None of this is particularly important to the story. It's just fun to teach the reader to swear.
KAEPU: Your friends are running headlong into the Uuplechan Patriot Armada.
VIKI: Oh, tlumnphrot.
Those idiots.
VIKI: They're going to get themselves killed.
KAEPU: And you must not warn them. Further complicity on your part will make things much worse.
VIKI: Even if I did care enough to warn them, there is no way the U.P.A. would listen to me.
KAEPU: I meant don't warn your sister, or her mercenary friends.
VIKI: Not an issue, because they're not in any danger.
KAEPU: Things just got much worse.