It was "Cat slash," because my name is Cathryn and I used to write almost exclusively slash.

Ahh, that is what I figured, but I didn't want to make any assumptions. I can't remember who it was right now but I had totally misconstrued someone's username for years till recently and it was one of those epic facepalm moments when I finally got it.

but catgen just doesn't have the same ring to it. *g*

LOL, yes. Too close to "catgut".