Pak, n. — Green’s Dictionary of Slang

Pak n.

[abbr.]

1. Pakistan.

1999

Indiawise Oct. 1: The Pak flag will be flying over the entire North-Western range of Karakorram.

2. a derog. term for a Pakistani.

1974		G.F. Newman You Flash Bastard 157: Those Paks copped for the lot, must’ve cleared up every reported case of dipping we’ve had.
2013		IOL News On Line (S.Afr.) 10 Mar. 🌐 Group visas for Pak nationals may be put on hold.

black Pak (n.) [its dark colour]

(drugs) a variety of hashish produced in Pakistan.

1966		personal recollection.
2002		Fabian & Byrne Out of Time (ms.) 160: I was gone before he got back from work, and I left him a grateful note and a piece of Black Pak.