To be fair, Cuthbert has no idea what it means, he's just using it as a way to say he's seen a few trolls since he's been here. But it wouldn't be the first and certainly won't be the last time he puts his foot in his mouth over something he doesn't understand.

"I'm not born of a grub, but of another human who was kind and undeserving of your vitriol. If I ken it right, you might call her my 'lusus'."

He just can't help but poke the bear here. "I would speak no ill of yours, though you seem to be begging for someone to do just that."