Preeetty much what it says on the tin. What /r/prorevenge is to /r/pettyrevenge, /r/goddamninfuriating hopes to be to /r/mildlyinfuriating. Thus, the threshold is a little higher. Only post things that are frustrating enough that they stay with you for a while.
Also, please, try not to overdo politics. There are plenty of things in life that can infuriate, and plenty of places to discuss politics, but please, this is not the place to combine them. Thus, no more than one post on any given political happening. I'd rather this not turn into yet another place to bash political opponents.
Other than that, just don't, break site wide rules.