I think the most epic loot that has dropped for me and I won would have to be http://www.wowhead.com/?item=29080. It was the very first tier piece I have ever owned. I played before the Burning Crusade, but I was a 60 for only a few weeks before BC came out, so I didn't get a lot of time to get the old school sets. I am very proud of my very fist piece of tier gear. ^_^
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My first epic loot was from questing in tanris over by where the pirates r.I was the only one there at the time so,i decided to farm the rum for my alchemy.About an hour or so of farming, I got this http://www.wowhead.com/?item=1980 and i was like wtf i cant use it but I was happy that i finally got something epic that was a drop instead of making it or doing raiding or heroics, it was a drop from a normal mob.....
http://www.wowhead.com/?item=28507 Handwraps of Flowing Thought was the most epic loot drop i've ever gotten in the time of Burning crusade. This item drop from the ''first'' boss of Karazhan :)
I'd have to go with winning the Sinister Squashling from HHM after so many runs just to get that one thing. It was just amazing for me.
On my troll shaman --> Swift Pink Hawkstrider I surely enjoyed riding around Orgrimmar and getting "nice ride" whispers
I believe that I was lvl 47 in Felwood killing though the Deadwood Warriors there when the Bloodrazor dropped for me http://www.wowhead.com/?item=809 still one of the most memorable epics I have ever gotten.