Here I go copying and pasting again. I found this at http://www.scottishgolfhistory.net/fore_caddy_derivation.htm:
Now here are three serious explanations for the origins of term FORE!
1) Because golf balls were pricey, golfers employed ‘Forecaddies’ to stand where the ball might land and reduce the number of lost balls, as is done in tournaments today. In 1875, Robert Clark mentions that Andrew Dickson performing this role for the Duke of York in 1681 and describes it as “what is now commonly called a fore-caddie”. It is probable that golfers called to their “Forecaddie!”, who would always be some distance ahead to draw attention to the fact the ball was coming and, in time, this was shortened to “Fore!” The nearly contemporaneous appearance of the terms caddie, fore-caddie and fore! chains this theory over the others.
2) A following explanation derives from the military battle craft of musket days, when rank after rank would fire fusillades, some over the heads of those in front. It was speculated that the term Fore! might have been used to warn those in front to keep their heads down. Modern historians pour cold water on this theory, partly because it is hard to relate it to a Scottish golf connection and partly because the relevant military terms used do not appear to be connected. But, this theory may in fact be a misunderstanding of the theory below.
3) Here is a third explanation, which appears utterly implausible, but which is an outside possibility. It derives from a report told by John Knox (1505?-1572) the ‘hellfire’ protestant reformer. He tells the tale, as only ‘hellfire’ preachers can, of someone arriving at the East Port (east gate) of Leith. This report was noticed by Dr Neilson and subsequently reported by Robert Browning in his book ‘History of Golf’ (1955) thus:
‘One among many comes to the East Port of Leith, where lay two fantastic pieces of ordnance, and where their enemies were known to be, and cried to his fellows that were at the gate making defence: “Ware Before!” and so fires one fantastic piece, and thereafter the other.’
So “Fore!” could be derived from an artillery term warning gunners to stand clear. This last explanation means, at the outset, that the term “Ware Before!” (“Beware Before!”) was foreshortened to “Fore!” (rather than “Ware!”) and, secondly, it must have been sufficiently well known to be used by golfers.
Fore warned is fore armed. A wayward shot and you shout “FORE” to forewarn others
Here I go copying and pasting again. I found this at http://www.scottishgolfhistory.net/fore_caddy_derivation.htm:
Now here are three serious explanations for the origins of term FORE!
1) Because golf balls were pricey, golfers employed ‘Forecaddies’ to stand where the ball might land and reduce the number of lost balls, as is done in tournaments today. In 1875, Robert Clark mentions that Andrew Dickson performing this role for the Duke of York in 1681 and describes it as “what is now commonly called a fore-caddie”. It is probable that golfers called to their “Forecaddie!”, who would always be some distance ahead to draw attention to the fact the ball was coming and, in time, this was shortened to “Fore!” The nearly contemporaneous appearance of the terms caddie, fore-caddie and fore! chains this theory over the others.
2) A following explanation derives from the military battle craft of musket days, when rank after rank would fire fusillades, some over the heads of those in front. It was speculated that the term Fore! might have been used to warn those in front to keep their heads down. Modern historians pour cold water on this theory, partly because it is hard to relate it to a Scottish golf connection and partly because the relevant military terms used do not appear to be connected. But, this theory may in fact be a misunderstanding of the theory below.
3) Here is a third explanation, which appears utterly implausible, but which is an outside possibility. It derives from a report told by John Knox (1505?-1572) the ‘hellfire’ protestant reformer. He tells the tale, as only ‘hellfire’ preachers can, of someone arriving at the East Port (east gate) of Leith. This report was noticed by Dr Neilson and subsequently reported by Robert Browning in his book ‘History of Golf’ (1955) thus:
‘One among many comes to the East Port of Leith, where lay two fantastic pieces of ordnance, and where their enemies were known to be, and cried to his fellows that were at the gate making defence: “Ware Before!” and so fires one fantastic piece, and thereafter the other.’
So “Fore!” could be derived from an artillery term warning gunners to stand clear. This last explanation means, at the outset, that the term “Ware Before!” (“Beware Before!”) was foreshortened to “Fore!” (rather than “Ware!”) and, secondly, it must have been sufficiently well known to be used by golfers.
Fore means Flying Object Returning to Earth. It was warning to the ‘fore’caddie, but I reflect the right answer was already given on this page.
“Fore” is something you yell to people to give them a warning that a ball is coming towards them.
Check out the links below for more info.
http://en.wikipedia.org/wiki/Fore_(golf)
http://www.scottishgolfhistory.net/fore_caddy_derivation.htm
If you play golf and your on a golf course and someone yells fore you better be ducking because their ball is headed toward you.