[Eric]

Colossal: http://www.merriam-webster.com/dictionary/colossal
Twat: Twat - Wikipedia, the free encyclopedia

So let's translate:

Nigel Beale is a stupendous vagina and you can, on a second occasion, see it for yourself.

I had to look up Nigel Beale on the internet, as I had never heard of him. We in the Netherlands don't hear much about what goes on north of the USA. Could we perhaps return to the Booker, man, instead of talking about large specimens of female genitalia? That lowers the whole tone of the discussion to that of adolescents who have just discovered what goes on between people's legs.

But if Mirabell says so, then Beale must be so.