I think it originated on the WotC boards, as a way of requesting honest feedback rather than supportive feedback.
I find it annoying in presumption, and I find it annoying that new posters may think there's some "magic incantation" they need to use to get feedback... or worse, some magic incantation that somehow guarantees them feedback.
I don't give "supportive" feedback, except for the blindingly obvious fact that nearly any constructive feedback is implicitly supportive -- if a person is paying attention to your idea at all, they're giving you a huge complement, even if none of the words typed actually say "good job! pat pat pat on head, free cookie".
Personally, I appreciate a good critique at least as much as adulation and/or free cookies.
It's silly and also the easiest way for me to determine which posts I won't bother reading. The only reason I'm posting on this one is to hopefully steer you clear from ever refering to fruit in your thread titles or anywhere in your post. The only exception being if you're OGLing a nifty, new plant monster that pelts PC's with said fruit for the world's enjoyment.
You are doing yourself a disservice to adopt such an acronym. Write your posts to the best of your ability and choose to believe that people who respond will do so with the best of intentions.
When someone responds in a less than respectful manner it is only a reflection on themselves.
I don't care what message board it comes from; adopting internet lingo is an affront to your education(no matter how poorly or well educated you are).
That being said, I hope to see you post something soon, sans any related fruit.