From @offgriddle's post... I know you meant the search engine... but I've heard DDG in this vein... but if I'm wrong let me know.
If it's not common enough we can delete it. Probably should, I don't think I've seen it used here.
- DDG - From the children's game of Duck Duck Goose, typically applied when fixing one thing breaks another.
Update: Yeah, deleted it...
I have heard of the game, but never in this context.
C22 or CCE for catch22 or cascade effect I have heard... same meaning as your DDG...