Green’s Dictionary of Slang

hop n.3

also hops
[ety. unknown; ? pidgin Chinese term from Mandarin ho ping/Cantonese nga pin = tranquillity, bliss, peace]

1. [late 19C+] opium.

2. attrib. use of sense 1.

3. [20C+] heroin.

4. attrib. use of sense 3.

5. [1910s+] any type of illicit drug.

6. [1910s–40s] morphine.

7. [1910s–50s] a regular drug user.

8. [1940s] in fig. use, a ‘drug’, e.g. religion.

In compounds

hop-crazy (adj.)

[1930s] under the influence of opium.

hop fiend (n.)

[late 19C–1940s] a drug user.

hop fighter (n.)

[1910s] (US drugs) an opium smoker.

hop gun (n.) [gun n.1 (6)]

[1900s–50s] (US drugs) a hypodermic syringe.

hophead

see separate entries.

hop house (n.)

[1910s] (US) a room or apartment where patrons gather to smoke opium.

hop joint (n.) [joint n. (3a)]

[late 19C+] a room or apartment where patrons gather to smoke opium or, more recently, to take heroin.

hop merchant (n.) [merchant n.]

[1910s] (US Und.) a drug peddler.

hop pad (n.) [pad n.2 (2)]

[1920s–40s] (drugs) a room or apartment where patrons gather to smoke opium or to take heroin.

hop party (n.)

[1920s+] (US drugs) a party where drugs of some sort are consumed.

hop stick (n.) [SE stick/stick n. (6)] [1930s] (US drugs)

1. an opium pipe.

2. a cannabis cigarette.

hop talk (n.) [the implication is that such talk is promoted by opium smoking]

[late 19C+] (US) foolish or exaggerated talk.

hop toy (n.) (also hen toy, hop toi) [late 19C–1950s]

1. (drugs) a container for opium, and part of the opium layout n. (6b)

2. in fig. use, a fantasy (although not actually based on opium).

In phrases

full of hop (also full of hops)

[1900s–20s] (US) behaving as if one were drugged, acting without sense.

hit the hop (v.)

[1940s–60s] (US drugs) to use a narcotic drug, usu. heroin.

hop (someone) up (v.)

[2000s] (US) to give an injection (of legal or illegal drugs).

on the hop

[1930s–50s] using narcotics.