An abreviation of "Too Far Gone" or "Too Fucking Gone," coined by Kyle Kulinski, a politicalcommentator and host of Secular Talk. The phrase is used to describe people who are so far right on the political spectrum that there is no hope for changing their mind on anything.
Too Far Gone. Used by some political pundits to describe people who are so firm in their belief in the opposite political ideology that they cannot be reasoned with, and will always defend the politicians incarnating that ideology no matter what.
A lot of Donald Trump supporters are TFG and we can't reason with them, but a lot of other Trump supporters only support him because of his populist rhetoric, and it's these people that the Democrats should try to convince.
This Fuckin Guy - one considered badass, insane, awesome, or a douche bag. Fits in just about anywhere you feel like putting it, much like thats what she said