if you mean what the hell I am on about, he's the 'anonymous' Top Gear track/pro driver.
If you're wondering who the hell is behind the mask, no one knows officially who the current stig is as far as I know but the original is meant to be Perry McCarthy (a former F1 driver).
The current stig though is believed to be a bunch of different people, not one set driver. There's a wiki entry for it all here.
wipeout
