The term 'Fishing Line Problem' refers to a situation in which a fishing line becomes tangled or snagged. The solution to this problem is to use the four-letter word 'SNAG'. Snagging is a technique used by anglers to free their lines from obstacles such as rocks, weeds, and other debris. It involves using a hook to SNAG the line and pull it free. This technique can be used to free a line that has become tangled or snagged, allowing the angler to continue fishing without having to cut the line.