0 used to say that someone claims to be a particular thing, especially when you do not accept that person's claim. Soi-disant comes from French:
The soi-disant quality newspapers are sprouting business sections, so there is a great demand for business journalists.
I think it is only right that railwaymen should realise that that is the attitude of their soi-disant friends.
Those who argue in this way have mesmerised themselves into accepting their own subjective judgments, simply because those judgments are dressed up in a soi-disant mathematical equation.
The position remains unchanged: that is to say, a soi-disant government, illegal, not recognised by us or, indeed, by any other country in the world.
It traces these soi-disant barons in an appendix.
Fanzines enabled fans to write not only about science fiction but about fandom itself and, in soi-disant perzine (i.e. "per" sonal "zine"), about themselves.