Slang: American vs British

This is a very funny video of Hugh Laurie (Dr House, An American doctor played by a British actor) at Ellen's Show (an American Comedian and TV Host) where they test each other on slang terms from their own countries.

flossing-выпендриваться
chin wag-болтовня, разговор
ba donka donk-большая женская попа
chuffed to bits-очень счастлив
shawty-девушка