Verified answer

It means 'you two are clever/not easily fooled/not to be messed with. We'll have to bring you to London.'

'Den paizeste' could also mean 'nobody can beat you / get the better of you' e.g., in sport.

Are you sure that's Greek and that it's all spelled correctly? Normally online translators can at least translate some of the words, but google's didn't translate anything.