Doesn't seem to be a terms that's quite taken place in airsoft over here, all the above comments seem to agree with my vague notion of what it is;
In terms of game style - quick paced arena based with unlimited respawns, often in arenas with not much/any effort put into making a realistic environment.
In terms of play style - sprinting around like a nutter with a high ROF weapon, paying little attention to military tactics/ethos for it's own sake, essentially what 'meta-gaming' is to computer games; ignoring all ethos/immersion and just doing what gets you most kills fastest.
The vague concept of it seems to apply perfectly to my style of play, although there's a stinking pit of bitching about levels of douchebaggery in this style of play from the american scene out there in the forums. People complaining about them being snobs in terms of having all the best kit (polastars usually), them dishing out high ROF overkill, and them being poor hit-takers. The comic cliche is them being displaced paintballers from California, and dude-ish douche-bags.
My guess is in the UK CQB comes close enough and provides a suitable arena for such a style of play, and there's not enough people wanting to skip the military immersion, for the term to really take off.
