I thought it was short for
United Kingdom of Great Britain and Northern Ireland.
(
Maximinimus you stick around I'll make it worth your while,
Fri 22 May 2009, 11:18,
archived)
I suppose it is too
perhaps we should just be Britland
(
Griffin Saver Something, something, 2006, something.,
Fri 22 May 2009, 11:26,
archived)