Maybe you guys could be more specific like calling them Feinstien liberals, or Peloski liberals, or Kennedy liberals, or Guilianni liberals or something.
Interesting that you should mention that. I think this crowd is at least somewhat used to hearing terms like libertarian Republican, religious right, and neoconservative to label people who affiliate themselves with conservatives without being the more traditional type one pictures (though by now, I think the religious right may be pretty ingrained). Not sure I've ever heard similar philosophical breakdowns of liberals though outside of classical liberalism to describe what the term used to mean (which bears more resemblance to libertarianism than what the term means now) before modern political definitions.
In any case, I think I've always just called them gun grabbers or anti-gunners. I tend to prefer to get into fights and debates on a case by case basis