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2.
A planet in the constellation of Kasterborous, and home to a race of aliens called Time Lords, the sexiest species in the universe. It was destroyed in the last Time War, along with all but two of the Time Lords.
The Doctor: Hello, I'm The Doctor. I'm from Gallifrey...

Everyone: *swoons*
by midnightx10 June 03, 2010
 
1.
The birthplace of The Doctor, a main character from a UK Science-Fiction programme. Sadly, it was destroyed.
Man, I wish I was born on Gallifrey like The Doctor!
by x Bowie June 20, 2005
 
3.
An expression of awesomeness routinely followed by a high 5
Person 1: Man i just ate a whole chocolate cake!
Person 2: Dude, that's Gallifrey =D
by TheOncomingStorm January 08, 2011