Someone who really, really sucks at golf. Not neccesarily a noob. There are people who have been playing golf for years and are still hackers.
Everyone starts as a hacker but all hackers should stick to cheap hacker courses and not go to good ones because they spoil it for the good players.
See that dude over there with the rental clubs and his visor on backwards?
Yeah, what a freakin' hacker.