It is a widely accepted term used frequently in Golf, other golfers know that when they hear fore the should be wary that a ball may be coming their way, and they'll duck because getting hit with a golf ball will hurt.
Golfers have to yell "FORE" to warn the people. Hope I helped. :)
FORE - Meaning lookout ahead
"Fore" is another word for "ahead" (think of a ship's fore and aft). Yelling "fore" is simply a shorter way to yell "watch out ahead" (or "watch out before"). It allows golfers to be forewarned of an incoming ball, in other words.
It's another way of saying "watch out" According to the site about.com: Fore" is another word for "ahead" (think of a ship's fore and aft). Yelling "fore" is simply a shorter way to yell "watch out ahead" (or "watch out before"). It allows golfers to be forewarned, in other words.
Golfers yell 'FORE' to let other players know that a ball is heading in their direction and that they should duck.
Years ago, when a player played golf, he had a caddy and the caddy had an assistant, the fore caddy. The fore caddy used to stand down the fairway and watch where the ball went, when the player hit, they used to shout 'fore' to let the fore caddy know the ball was coming. It is now a term used to let other players know that a ball may come near them.
It is "Fore", not "four", hence not "five" either. The "Fore" comes from the old use of "Fore-caddies" who were down the fairway looking for the golfers ball coming down the fairway from the tee. The golfer would yell "Fore" telling the "Fore-caddie" that the ball was on the way. Now, of course, "Fore" means "Watch out! Ball is coming your way."