1. [late 18C–mid-19C] gin and water.
2. [1960s+] (drugs) any form of amphetamine drug, e.g. amphetamine sulphate, methedrine, methamphetamine.
3. [1970s+] a thrill of excitement, esp. when drug-generated.
4. [1980s+] (drugs) crack cocaine.
5. [1990s+] heroin.
see bug n.4
[1990s+] (US drugs) a regular user of amphetamines; also attrib.
[2010s] illicitly manufactured methamphetamine.
[1980s+] under the influence of amphetamine or crack cocaine.