I've been pig hunting with my buddies about 3 times when I had nothing better to do (really, nothing better than scratching my ass). As far as I can tell it was just randomly driving, drinking, and shooting (at random objects), not necessarily in that order. This all took place in the southern Olympics (Upper nooch), where the feral pigs supposedly live.

I think it is just another story made up by some good ol boys to allow themselves to spend more time away from their old ladies, kids, and responsibilities. Seems to be working because I've talked to quite a few "pig hunters" while fishing summer runs.