Green’s Dictionary of Slang

(US drugs) a mixed injection of heroin and cocaine.

2006		Urban Dict. 29 Apr. 🌐 My man died off a belushi, yo.
2013		T. Dorsey Riptide Ultra-Glide 22: Coke [...] Charlie, Chippy, Belushi, Foo-Foo, Merck, mojo, movie star [etc].