'It's not cool to say Yo any more,' said Wobbler.

'Is it rad to say cool?' said Johnny.

'Cool's always cool. And no-one says rad any more, either.'

Wobbler looked around conspiratorially and then fished a package from his bag.

'This is cool. Have a go at this.'

'What is it?' said Johnny.

...

'Yes. We call him Yo-less because he's not cool.'

'Anti-cool's quite cool too.'

'Is it? I didn't know that. Is it still cool to say "well wicked"?'

'Johnny! It was never cool to say "well wicked".'

'How about "vode"?'

'Vode's cool.'

'I just made it up.'

The capsule drifted onwards.

'No reason why it can't be cool, though.'