i ate an adults portion of 2 fried eggs and a plate of chips, plus 4 slices of bread and butter, followed by a stupidly big knickerbocker glory, when i was 9. i remember that iwas so full that i almost couldn't walk afterwards- my stomach was so distended. i was past full before i even got the desert. my parents practically carried me out of the cafe. urgh. double urgh.
Well, once I was eating my breakfast cereal, and just as I was pouring the soy milk, I noticed there was a 10 floor apartment building in there, life-size. I heard people shouting out of its windows when I put it on my spoon and ate, so I guess it wasn't a very vegan meal
I once did something like 6 very large burritos (and by large I mean they were so stuffed I could barely hold them properly) in a single sitting. Couldn't even summon the energy to get off the couch for hours. Probably not very healthy, but when I make burritos I just can't stop until I've eaten every single bite.
I reckon I probably ate something much bigger back in my omni days, but I really can't remember anything specific.