I heard this expression today and it made me cackle inwardly with laughter.
But actually I think it deserves a revival.
It is nicer than "What the Fk", more descriptive than "What on earth." Better than - "What the hell, or In God's name.." which seems a bit heavy at times.
I shall reclaim this expression like a piece of marshland.
WHAT THE DICKENS I SAY!