My most epic loot drop would have to be Arcanist Pants. I had been raiding MC with my guild for a little over 6 months. For the duration of that raiding period Arcanist Pants had dropped twice, one time when I missed that day of raiding...the only day in the six months I missed. The second time they dropped I won, it only took 6 months for me to get those pants, but it was indeed epic. The pants completed my 8/8 Arcanist Set and made me a very happy mage :). I will never forget that rewarding night.
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My most epic drop was King's Defender on my tank. Not that the weapon specifically is rarer than most, but my guild new I had wanted it for awhile, so they spam clicked the loot chest after chess (once someone had said "Oh, wow, Boom.") to keep me from confirming the drop or assigning it to myself, being master looter. This went on for so long that someone went out to the repair guy in front of chess, and the mobs controlled by Netherspite (before chess) had RESPAWNED. /rage
During the Hallow's End event this year, I became kinda obsessed with getting the Horseman's Helm. I went every day trying to get the helmet with sometimes more than one group of people a day. One day it finally dropped but there happened to be a dps warrior in the group so I let him have it since he needed it more than I did being a tank. I kinda hated myself but I couldnt bring myself to take it from him. Every day I kept trying to get the helmet but it never dropped again until the very last try on the last day of the event. I went nuts.. I was like OMFG OMFG OMFG etc.etc. I was like can I PLEASE have it? And of course, being guildies and knowing how much I'd been wanting it they let me have it. I was so happy that I gave 200g to the people in the party and then deposited 444g in the guild vault. I know its not that great a helmet, especially for a tank but I just love the laugh.. Not to mention it looks pretty funny. I still keep it in my bank and every now and then when I'm bored of playing I go put it on and laugh with it.
I gotta say that one of the must epix of loots i have gotten in the 4 years of playing wow was... The stoppable force! One of the most fiercest weapons i have ever seen. -Gloat- Next to my Titan steel destroyer. And yadda
I know it isn't really epic but I just got my Felsteed. It is my first mount and I think it is really cool.
The most epic loot I got was the Dragonspine Trophy from Gruul's. When the trinket dropped, all the DPS rolled need and the top four rolls were 93, 95, 96, and 100. I got the 100 roll and everyone in vent was freaking out. Not only did I get a great DPS trinket, I got it off of an epic roll.
Easily the most epic drop I've gotten has been the Ashes of A'lar. Virtually nothing has come close to being as awe-inspiring as the Phoenix mount.