User blog comment:Darknesslover5000/What did Aizen mean when he said to Ichigo "Eating you...is something that can be done after all is finished."?/@comment-1248963-20100605073341

Assuming that Aizen has gone Hollowification is overboard. Two reasons. 1) Aizen himself said he'd never Hollowify himself. 2) Aizen said the Hogyoku's power was not breaking the boundaries between Shinigami and Hollow, but materializing the heart's desires, and later announced that his desire to break the boundaries between the earthly and the divine was to be materialized by the Hogyoku. That's completely different to Hollowfication. So stop saying Aizen has Hollowfied, we don't know what he is at this point. We don't know if the Hogyoku really did what he expected it to do.

About the "eating" matter... I don't want to delve that much into it, it's just too much speculating for my liking. Is it literal, is it metaphorical? Only Kubo knows. It was a pretty violent way to say "Imma kick your ass" and that's all I can say about it because I don't think I could give a proper interpretation. Specially not before we get the reliable translation.