[own up] {v.}, {informal} To take the blame; admit your guilt; […]

[own, owned, OWN3D, ownt] (see also [pwn]) To defeat someone (used […]

[ownzer] One who "owns" (see [own])

[OXO] Norwegian/Danish shortening of the word "også", which translates to "too" […]

[OYATM] "One Year Ago This Month" used in Usenet binary groups […]

[oyster] See: [WORLD IS ONE'S OYSTER].

[p] See: [MIND ONE'S P'S AND Q'S].

[P07] Another way to type "pot" as in "weed" or "grass". […]

[P2P] "Peer-to(2)-Peer". Also "pay-to-play" for games with subscription fees like Everquest, […]

[P911] Parents are here dont type sumthin stupid!