Flossing is a term for fishing with a looong leader. The trick is getting a good drift between your weight and lure. If you are fishing with corky/yarn, dick nite..that kind of thing. The leader basically gets between the jaws bringing the lure into the mouth, usually right in the corner. It is perfectly legal and ethical to hook a fish this way the mouth. My issue at times is when you see somebody fishing in this manner and putting a big jerking sweep into the rod. The end result is usually a snagged fish..different story. There ar some, but only a few, areas in the states where fishing for steelhead/salmon in this manner is prohibited. However, since WA has no leader length restrictions it is up to the fisherman to drift fish ethically or be a snagger. Big difference between the two.