Green’s Dictionary of Slang

1. Puerto Rico.

1909		Century Dict. Supplement n.p.: P.R., an abbreviation [...] (b) of Porto Rico.
1962		(con. 1953–7) L. Yablonsky Violent Gang (1967) 92: He spoke of his father as ‘a no-good prick who bought me over here from P.R. when I was a kid and cut me loose’.
1975		E. Torres Carlito’s Way 71: Last time I heard, Tuta got married down in P.R.
1995		(con. 1985–90) P. Bourjois In Search of Respect 97: My father’s been a working man all his life. He came from PR when he was twenty-one.

2. a Puerto Rican.

1957		Laurents & Sondheim West Side Story I i: You hoodlums don’t own the streets. There’s been too much raiding between you and the PRs.
1963		in T.I. Rubin Sweet Daddy 116: Just take a look at the yard [...] Blacks with blacks. P.R.s with P.R.s.
1977		E. Torres Q&A 21: That’s the trouble with you PRs. You breed like rabbits, don’t wanna work.
1983		J. Flaherty Tin Wife 199: I never daydream about blowing away a spade or a PR.
2000		M.E. Dassad ‘Chickenhawk’ at www.cultdeadcow.com 🌐 Those two men, the PR in the overcoat with the gold tooth, and the black guy with the hat, they’re pimps.
2017		D. Winslow The Force [ebook] ‘I’m a P.R. from the South Bronx’.

3. attrib. use of sense 2.

1963		H.S. Thompson letter 15 Aug. in Proud Highway (1997) 386: What about the PR piece?
1974		(con. 1960s) R. Price Wanderers 27: Howdja like them bazooms on that P.R. chick?
2004		J.A. Juarez Brotherhood of Corruption 113: ‘How about Suarez and Manriquez? [...] Looks like their PR (Puerto Rican) connection in city hall pulled some strings’.