No such thing as a fully fed galactus, his full satiation point was never stated, never shown. He might have an infinite appetite, which means he needs to eat The One Above All to achieve his "fully fed" status. When big G needs to fight someone, he eats a few planets. He doesn't eat a galaxy, or a solar system, he doesn't absorb entire dimensions. Just a few planets before fighting Celestials that he knew were capable of killing him, probably the same for fights against Odin and Ego as well. Galactus can absorb massive amounts of space, like Mephisto's realm and it will not satiate him at all. Certain energy types are required to feed him. So, Galactus absorbing enough to fully satiate himself simply has not ever happened and likely will not for some time. It is an internet meme made up by comic fans.
Odin knocked Galactus out. If Galactus is too stupid to stock up on food to his max before invasion of Asgard, then he isn't smart enough to beat Odin in a no holds barred fight out in space and away from life. Galactus could not stop Odin, Odin could not stop Galactus. But, just like Galactus has repeatedly shown for 40 some odd years of marvel comics, he is not a physical being and does not need to heal. He can continue onward after sustaining massive energy loss. Odin bleeding and needing a breather does not equate to Galactus being superior to Odin in battle. It just means Odin is more mortal, and Galactus is just energy that takes the form of a physical being.
IMO, Odin would take out Galactus if he wanted to kill him, but he would sustain massive injury. The end of Galactus might also mean the end of Odin, or at least permanent damage taken on Odin. I don't think Galactus has what it takes to stop a bloodlusted Odin.
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