(US, slang, street slang) The police.

Abbreviation of care of. / Initialism of certificate of origin, a document used for shipping purposes. Describes country of origin of a given product.

Initialism of resisting and obstructing

Initialism of strategy and operations. / Initialism of stipulation and order.

Abbreviation of month(s) old.

Abbreviation of year(s) old; also yo, y.o. / (knitting) Abbreviation of yarnover.

Initialism of olefin and surfactant.

(mathematical analysis) Upper bound function; see big O notation. / (slang, usually preceded by "the") Orgasm.

(slang) Alternative spelling of oh for

Water as a chemical substance. / (Malaysia, Internet slang, humorous, politics) Hishammuddin Hussein Onn, Malaysian politician and son of Hussein Onn, third prime minister of Malaysia.