Goofball

Formerly and through the late 1980s anf 1990s, slang for barbiturates. Later expanded in common vernacular to include benzodiazepines (such as Xanax and Valium).

Commonly used today to describe the recreational combination and use of heroin and methamphetamine via IV injection.

When cooking up a hit of dope, "I got a couple points of shards, too; you wanna slam a goofball?"