Childish, yes, Funny, yes. Come on, it's Friday afternoon.
Apparently it means "full speed ahead for Top Gear", and refers to Top Gear Live's first ever appearance in Norway early next year. If "speed" really is "fart" in Norwegian, we would recommend our Scandinavian brothers brace themselves for a series of wind-based jokes once the show starts...
EDIT: According to TheDuisbergKid, a Top Gear fan corresponding on Twitter, the Norwegian for "speed bump" is "fart damper". What an excellent language.
For more Top Gear Live related hilarity, here's a nice video of Jeremy and James aboard the Dunsfold 747.
And remember, dates are below and tickets are available here - they're selling out fast...
UK & Ireland
London, Earls Court: 4-7 November 2010
Birmingham, NEC: 11-14 November 2010
Dublin, CityWest Event Centre: 26-28 November 2010
Brisbane, Brisbane Entertainment Centre: 3-6 March 2011
Melbourne, Melbourne Showgrounds: 11-14 March 2011
Johannesburg, Kyalami Grand Prix Circuit: 17-20 March 2011
Oslo, venue tbc: 24-27 March 2011