Colombian, n. — Green’s Dictionary of Slang

Colombian n.

also Colom, Colombo, Columbian

[the mis-sp. is almost as common as the correct one]

1. (drugs) marijuana from Colombia; also ext. as Colombian green, Colombian red, etc.

1970		G. Scott-Heron Vulture (1996) 12: Along with Colombian Gold, Acapulco, and the powerful Black smoke from Vietnam, it [i.e. Panamanian Red] is very hard to come by.
1976		R. Sabbag Snowblind (1978) 17: A joint, eighty-dollar Colombian, passing clockwise around.
1981		D.E. Miller Bk of Jargon 337: Colombian, Colombo: High-potency marijuana.
1981		J. Ellroy Brown’s Requiem 178: Six hundred scoots will get me a half-pound of Columbian and that hooker you told me about.
1984		D. Jenkins Life Its Ownself (1985) 215: He might tell you he’s got some good Colombian.
1993		R. Shell Iced 124: Drinking some chilled white wine, puffing some Colombian red-reefer.
1994		P. Baker Blood Posse 66: Them naughty Dreads [...] got some wicked Colombian red.
1994		G. Smitherman Black Talk 81: Colom Marijuana imported from Colombia.
1998		L. Stringer Grand Central Winter (1999) 26: Biggie [...] starts going fidgety, staring anxiously at the door as if we had a couple of keys of uncut Colombian stashed in the mattress.
2001		ONDCP Street Terms 6: Colombian — Marijuana.

2. (US drugs) cocaine.

2012

T. Robinson ‘The Long Count’ in Dirty Words [ebook] Half-pound of uncut Colombian.

In compounds

Colombian necktie (n.) (also necktie, Sicilian necktie) [orig. in the drug wars of Colombia]

a method of killing whereby the throat is cut and the tongue pulled through the resulting wound; such embellishment is usu. meted out to one who has betrayed the killer or his boss.

1986		C. Stroud Close Pursuit (1988) 99: Somebody had given him a ‘necktie.’ His throat had been cut just wide enough and deep enough to allow his killer to reach up inside and pull the thick muscle of his tongue out through the wound.
1997		D. Lehane Sacred 152: You rip off a drug lord down there, you die one way and one way only — Colombian necktie. They cut your throat and pull your tongue out through the hole.
2003		H. Hill A Good Fella’s Guide To N.Y. 214: MAFIA’S TOP-TEN HITS. Squirmer...Steak House Ambush ...Copper Migraine...Brooklyn Fogger...Sicilian Neck Tie...Bad Starter...Garrote...
2008		T. Piccirilli Fever Kill 16: The twenty-floor swan dives, the Colombian neckties, the children murdered by their own parents.
2010		Codella and Bennett Alphaville (2011) 138: Spider-man sticks the knife into her throat and gives her a necktie.
2012		T. Robinson ‘So Long, Johnnie Scumbag’ in Dirty Words [ebook] ‘[T]he only guy crazy enough to actually give somebody a Columbian Necktie after he’d kill him’.