American
English, bastardized way of saying "get good". A very
short, succinct way of saying: Quit playing the incompetent victim; practice makes
perfect; You can do better, so do better.
Also a way a dismissive way of saying that you will not waste time holding someone's hand, walking them through how to do something when all they need to do is temper themselves through repetition.
"No matter how much I try to
finger this part on
guitar, I can't seem to play it. You can do it so
well though. Teach me how you do it!"
"Git gud, faggot."