a nod's as good as a wink to a blind bat

– Idle: Is your wife a… a goer… eh? Know what I mean? Know what I mean? Nudge nudge. Nudge nudge. Know what I mean? Say no more. Know what I mean?

– Jones: I beg your pardon?

– Idle: Your wife… does she, er, does she ‘go’… eh? eh? eh? Know what I mean, know what I mean? Nudge nudge. Say no more.

– Jones: Well, she sometimes ‘goes’, yes.

– Idle: I bet she does. I bet she does. I bet she does. Know what I mean? Know what I mean? Nudge nudge.

– Jones: I’m sorry, I don’t quite follow you.

– Idle: Follow me. Follow me. And I like that. That’s good. A nod’s as good as a wink to a blind bat, eh?