I usually just say the names of the characters (the slash is silent) but will sometimes spell out "A-slash-B" for clarity.
I think I've been gradually drifting from "eff-list/lock" to "flist/flock", but lately favour "dwircle" (what? I like it) and plain old "lock", cuz whatever.
And my CBC-Canadian accent usually pronounces W "double-you" rather than "dubya", but I spell out WIP when I say it out loud.