Git R Done is a common phrase used mostly by the people living in the southern states. The term is used when a person is about to tackle a task are it can simply be used in any conversation for no apparent reason. Usually Git R Done is used to state how you or someone feels about something in an excited type of phrase. Most people think that only rednecks and wannabe southerners use this phrase but thats completely untrue.
Jimmy: Damn Did you see that fine ass chick over there? Man I sure would love to get a piece of that.