Yes I doubt most people saying No deal WTO rules know exactly like they think they mean.
I had to use a example so people not clued up could understand.
You are employed to do a job and are paid £20 a hour (Agreed deal) You tell your employer to screw themselves and say you are going to leave and get another job that follows the rules of WTO. But shockingly the only job you can get now at the same level is £7.83 an hour as that is the base line of World Trade organization (its the bare minimal countries are allowed to trade at + a whole raft of rules that you have to follow).
Few people in their right mind would do that sort of thing, so when people say bring on the no deal / WTO version of trade it shows ethier how stupid they are for not know what it means or are disaster ecnomists that are set to make a lot of money out of a crash out.
Look at the actions of the rich die hard Brexiters dont listen to their words look at their actions (moving money abroad applying for dual nationaitly etc) While say Brexit is going to be great taking back control etc