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2.
An abreviation of the popular Sci-Fi Comedy radio, book or television series or feature film Hitchhiker's Guide to the Galaxy, written by British script-writer-turned-author,Douglas Adams. Popular on internet forums as it is shorter and quicker to type than the rather ungainly HHGTTG.

See Hitchhiker's Guide to the Galaxy for more info.
Hoopy Frood A: OMG, I just love H2G2!
Hoopy Frood B: I know! I'd like to sass that Frood, Douglass Adams.
Clueless User A: WTF is H2G2?
Hoopy Frood A: Just ignore him, he has no idea where his towel is...
by Jupiter-x October 27, 2006
 
1.
1. Abbreviation for Hitchhiker's Guide To The Galaxy.

2. A BBC community website in which its members are producing an online encyclopaedia of life, the universe and everything.
I am writing an entry for h2g2.
by Random July 27, 2003
 
3.
An abrivation of the name of the book "The Hitchhicker's guide to the galexy."
1. I'm reading H2G2.
2. I love H2G2
by Kyrouge Masta March 03, 2005
 
4.
The best website in the world, ever.
Man, that site's almost as good as h2g2!
by Darth Ridley February 02, 2004