(intransitive, colloquial, vulgar) Abbreviation of jack off or jerk off.

present participle of J/O

(Cockney rhyming slang) A wank.

(physics) A subatomic particle with an unusually long lifetime and a large mass; a bound state of a charm quark and an anti-charm quark.

(ASoIaF/GOT fandom slang) In A Song of Ice and Fire and Game of Thrones, the theory that the character Jon Snow is the child of Rhaegar Targaryen and Lyanna Stark. In Games of Thrones, this theory was shown to be correct.

plural of J/psi particle

Synonym of J/psi particle

(computing, slang) An unspecified person or user on a computer network.

plural of J/psi meson

(US) A job in which one remains for one's whole career until one's retirement.