You really don't need to worry about it. I can assure you that it's not in general use (in any variant of English, as far as I know) and you're unlikely ever to stumble across it again. I suggest you move on.
Wodehouse's characters often use descriptive language meant to show that they've been exposed to a high level of education without necessarily absorbing much useful knowledge. The speaker is using a roundabout, vaguely literary way of saying that Bertie has eaten a lot; he's so full of the meat he's been served that he's practically exploding.
If it sounds strange, it's because it's meant to. These characters like to sound different from the common herd.