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A kind of PDA mobile phone based on Windows Mobile that often hangs, freezes, or crashes for no reason.
Damn, my O2 crashes again, this is the 3rd time I had to restart it today!
by Chak February 17, 2008
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8
2nd largest British mobile network. As of 2016 owned by TelΓ©fonica.

O2 was the biggest network until T-mobile and Orange UK merged to form EE, part of BT. O2 responded by launching their Priority service and "Be More Dog" advertising
How have you got full 4G here - who are you on?

O2
by CSD123 October 30, 2016
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9
A person that is "unique" and is "special", the one and luckly only.
O2 of Lambert C Block, The Lawns, Cottingham, Hull, England
by C Block Mafia September 26, 2005
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10
A word used to describe a whore, slut, or a flamboyant gay person. The reason being O2 is the makeup of oxygen. And oxygen is everywhere, it gets around. Just like slutty person.
I dont want to go to there, it will be filled with O2's
by stupidyellowbear69 January 16, 2011
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