This is very simple and yet very efficient, Have you ever world PvP'd and finally get out of combat to find you are about to be back in combat again after they rez or call there friends and you have 0 time to prepare for them, well this is a hint that will save you from dying and also give you tons of time to eat up or even go AFK. ((Not really a exploit but works kind of like one))
1st Q for a dungeon with LFG system (Using 3 or more people is better so they can't vote kick you)
2nd Ignore the other 2 people in the dungeon or however many is there, it takes 50% vote to be kicked so if you have 3 people you cannot be kicked, they will leave some time after they nerd rage
3rd You can now go to Stormwind or Org or wherever you are going to PvP (Right click teleport out dungeon walk there) and whenever you need a break to drink or just to hide for a few or to AFK you right click teleport to dungeon. (Obviously this only works when you are out of combat, but it will save you from going back into combat and time for you to drink and eat).
Yes its simple and works very well
There is another thing you can do, horde only though. in Stormwind there is a safe haven (Here is link http://www.mmowned.com/forums/world-...ttack-you.html) but some how you can teleport to dungeon even with the guards still argro'd on you. but if allys are on you in the safe haven it does not work, only works for guards.
How is this second part helpful? Lets say you kill a few allys and now are in combat from the guards you can run to the safe haven (Sometimes it takes 1-4 secs) teleport to dungeon. (most likely allys know where you are hiding and will some come get you, they will now go to the safe haven and think you hearthed or something)