Green’s Dictionary of Slang

job v.1

[SE job, to pierce, to thrust something into]

1. [mid-16C+] to have sexual intercourse; thus jobbing, sexual intercourse.

2. [early 19C+] to hit, to beat up.

3. [1970s] (drugs) to inject a narcotic; thus as n. an injection.

4. [1980s] to harm, to injure.