RhymeZone: opp definitions

Definitions of Opp:

name: A surname (common: 1 in 100000 families; popularity rank in the U.S.: #17629)

noun: (slang, among criminal gangs) An opponent; an enemy; the opposition
noun: A city in Alabama.
noun: Initialism of other people's problems.
noun: Initialism of Ontario Provincial Police, the police force of the Canadian province of Ontario.
noun: Abbreviation of opportunity. [A chance for advancement, progress or profit.]

(Definitions from Wiktionary)