It sounds impressive-- Cat clans?-- but beyond that, no, it means nothing to Ruka. Still it clearly means something to Bluestar, so she'll be respectful of it. "Nice to meet you."

At least it's a first for both of them, and Ruka rests her hand back on her lap. She can guess that 'Twoleg' means humans. "That's a shame. It seems like you'd have a lot of interesting things to say. You live in a clan of cats?"