Head's up----is also used on the golf course, but there most people say "Fore" which means "look out", "watch out" or it is just a polite way that golfer's say "move". But my dad always said "head's up" when he was trying to get us kids to "pay attention" so, I guess "head's up" sound less rude to a co-worker than "Pay attention"!!!!

enthusiast

enthusiast