When it's time to lay a egg the egg takes up around 30% of the bird's mass. Hence the Kiwi idiom "as full as a kiwi is when it is with egg"

That is not a Kiwi idiom.

R.I.P. Godzilla...

I lived in New Zealand for 24 years. Literally never heard that said. Not a real saying.

Who says that? No one. You tit.

Yes, the kiwi idiom.. she was tight as a kiwi's cloaca and was ready to settle.

I’ve never heard that. It’s a bit too wordy.

It looks like a pain in the ass

so this is how kiwis are made? kiwis make them. it's not an egg

Why did I read your title with Brick's voice?