Hey that's Walrus' line!

Or signature at least.
Good description for Clare tbhI honestly wonder why they picked the words they did

but seriously I think it just went something like
'Okay dude we can't keep calling them "the ones with boobs"'
'Agreed'
'And it's kind of awkward being called "boobless one"'
'Agreed'
'Codenames?'
'Codenames.'
And then they said the first words that came to mind.
Linguistics.