1. in US drug uses.
(a) [late 19C–1930s] a small pill of opium, costing 25 cents.
(b) [1920s–40s] one who injects narcotics, esp. when using a rudimentary syringe based on a pin and medicine dropper.
(c) [1960s] an amphetamine user.
(d) [1960s+] a very thin marijuana cigarette.
2. [late 19C+] (orig. US) a stupid person.
3. [late 19C+] (orig. US) a person with a small head.