When a fisherman jumps ahead of you in the next fishing hole or the current fishing hole you are in, potentially catching your fish.
Don't be a D-Bag and low hole people. Start at the top of the run and wait your turn. There's an etiquette in certain sports and in sport fishing Low Holing is like talking in the back swing of a Golfer teeing off. If someone is camping on a spot ask if its alright to take a run through the hole after they take a pass. If someone is on a Bar or in a Hole you wanna fish, tough ****. Wait your turn or move on. Try to show a little respect to your fellow fisherman.