a relatively new meme, spawned from Never Mind the Buzzcocks Series 23 Episode 12. The presenter, David Tennant (off of Doctor Who) would, after reading out an innuendo-basedjoke, would say "BARROWMAN!" (implying blamehood upon John Barrowman) and brandish his fist at the screen.
The meme now just represents blaming any problem you happen to have at the time on John Barrowman.
McFly's song contained the lyrics "there's nothing on Earth that could save us since I fell in love with Uranus. Which as it happens was a line removed from the pilot episode of Torchwood"
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.