Even though I’ve never seen it abbreviated as such, I can tell you that there have been several times I’ve wanted to tell a poster to fuck off and die because it’s such a common insult, and have always refrained from posting that particular phrase because of the rule against wishing death on another poster.
I like some of the alternatives suggested here, though. 
After which we’ll ban whoever hasn’t been following them.
FOALMHN
Fuck off and lick my hairy nutsack.
Or maybe you should lick my hairy nutsack first:
LMHNAFO
Please do not choke while licking my hairy nutsack as I do not want you to die. Only to lick my hairy nutsack. And then fuck off.
Since it ain’t broke he’s gonna keep fixing it until it’s broke.
Apparently.
FOADSTIGTHRRBAIALRAEHSWWRIMBATSTDTYWNBATPTFYIB
Fuck off and do something that is going to hurt really, really bad and in all likelihood require an extensive hospital stay which will result in medical bills amounting to several thousand dollars that you will not be able to pay, thereby forcing you into bankrupcy.
From the Italian Swiss Otter Colony?
Seriously:
Wring is (w)right. Rules need to be announced prior to anyone being expected to comply with them.
Sapo was in many ways a belligerent jerk. He did make some very positive contributions – and he also had a way of pushing reminiscent of a very jmmature eighth grader seeing how much he can get away with. Following warnings, of which he appears to have gotten quite a few, banning or suspension for violating good old Rule #1: Don’t be a jerk, would have been justifiable.
Ed does have one justification for his stance. Sure it’s clear that telling someone in jest, ‘Fuck off and die’, is not in fact a death threat or wish for harm, but simply an exaggerated expression of irritation. But direct threats and wishes for death have been banned, and Ed made it quite clear that there’s a large grey area between hyperbole and sincere threat, and he doesn’t want to have to put the moderators in the position of deciding (a) where in that grey area the line is drawn, and (b) whether any specific instance of a threat or death wish is on one side or the other of that arbitrary line. So he did make it clear that he wanted no more such threats and deathwishes. even in jest. IMO, that’s a pretty mild restriction on an otherwise broad-open span for expressing anger, outrage, and similar Pittish behavior – and it is conducive to a somewhat more civil environment in which to express such anger/outrage/whatever.
Snark is fine. Part of what drew a lot of us here is Cecil’s way with snarkiness. But it seems to me that there does need to be some sort of limit, so we don’t turn into the Internet equivalent of the dysfunctional family reunion that everyone hates attending. Where that line is, I don’t know. (Actually, Carnal K’s input might be useful here. He has a connoisseur’s appreciation for snark, but also the sense to know how far to go and when to stop – further than I would, to be sure, but his definition might be just the one we need to suggest the maximum permissible.)
Leave me out of this 
Oh, and catsix wins the thread!
FOAD
Fuck Off And Diet.
(Reprogramming macro keys is just too much trouble.)
FOAD
Fuck off and drive
FAANF
Fake Acronyms Are Not Funny
HAND.
Enjoy lots of conjugal relations with your significant other before dieing of old age
I think CarnalK would have the potential to be a great pit mod.
I never won a thread before. Do I get an internets as my prize?
You need to add YCAB.
Wait, where is a copy of this rule book? I mean the *Pit Rules for Dummies *version because I’m confused…
Bullshit. Even telling someone in all seriousness to “Fuck off and die” is not a threat. Continuing to call it one is assinine.
FOAM: Fuck Off And Masturbate.
I always preferred “Eat Shit And Die,” maybe because of the delicious (?) ambiguity of whether the speaker wants you to have a terrible final meal and then die or wants you to die from e. coli poisoning resulting from the fecal partaking. But I guess “ESAD” is out of the question as well. So how about DESADD? Or PDESADD --Please Don’t Eat Shit And Don’t Die.