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2nd largest British mobile network. As of 2016 owned by Teléfonica.

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
o2 by CSD123 October 30, 2016
Related Words
O2 O2MG o2trappy O₂ O2-Tango o2 trapstar o2 trapster o23 o26y O27
A person that is "unique" and is "special", the one and luckly only.
O2 of Lambert C Block, The Lawns, Cottingham, Hull, England
O2 by C Block Mafia September 26, 2005
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
O2 by stupidyellowbear69 January 17, 2011
A molecule of oxygen. Made by one atom of oxygen taking 2 electrons from the other atom and vice versa. Fundamental for all life on Earth.
a: What did Ariana Grande mean when she wrote the song "just keep breathing"?
b: Well she meant that you need to breathe O2 to survive.
c: No, dumbass. She meant that you need to keep smelling her perfume.
Ariana: No, get help c and b.
O2 by respectable.person December 23, 2022
I breathe O2!
O2 by greekmadlad March 31, 2024
That shit funny AF I need some oxygen!!!
That shit (joke) was O2 affff!!! BOUL HAIR LINE GOT ME O2 af!!!! Need some oxygen cause that shit was funny!
O2 by JNNNNNNNNNN April 3, 2025