The term (I'm pretty sure) was first coined by Dogman in response to his frustration at seeing people knocked out of heats by guys doing slippery, slidy turns as opposed to full rail carves - at which he is the undisputed master.
It is not IMVVHO as stated by CMC a result of board design but rather a conscious effort to avoid using the rail through an entire turn thereby sliding through the latter part of it - this could be argued that it makes the turn faster and less risky but reduces the amount of spray


The banter in the other forum is the typical State v State stuff and shouldn't be taken too seriously.