OFF: Brit Slang!

[Richard Lockwood]

> For those who enjoy a more arch turn of phrase, it can be refined e.g "I
> took the young filly out for a meal, invited her back for coffee, and
> Robert was your proverbial mother's brother". (to be said languidly,
> perhaps while sharing some absinthe with one's decadent gentleman
> friends).

Or, round our way, "Robert's your auntie's live-in lover"...

Cheers,

Rich.