Too snob to use the "Tube" (London Underground).
Limo, helicopter or at least a cab will do.
"Posh" is referring to Visctoria Beckham, of course.
I was in a conference in London and told a colleague I need to drop by in the office in between the sessions.
He asked me how I will get there.
I told him I will use the tube, he replied "I thought you were too "tube posh" !