Green’s Dictionary of Slang

geek n.3

(drugs) a mix of crack cocaine and marijuana; thus geek joint, a cigarette filled with such a mix.

[US]ONDCP Street Terms 10: Geek – Crack mixed with marijuana; Geek-joints – Cigarettes or cigars filled with tobacco and crack; a marijuana cigarette laced with crack or powdered cocaine.

In derivatives

geeker (n.)

(US gang/drugs) a regular user of narcotics.

[US](con. 1990s) J. Miller One of the Guys 77: She committed a series of crimes [...] including [...] ‘jacking a geeker’ [robbing an addict].

In compounds

geek monster (n.) [-monster sfx]

1. (US campus) a crack n.7 whore.

[US]College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Geek monster (noun) {offensive} A woman who is a crack addict and whores herself for hits.

2. (US police) an habitual crack user.

[US]J. Buskey Tinged Valor 23: These two seasoned police officers went on about Sergeant Willows’drug habits [...] They referred toSergeant Willows as a true ‘GeekMonster’ (police pet name for anyone pining away in their addiction to crack cocaine).