Green’s Dictionary of Slang

1. (UK prison) to discipline, to put on report.

1956

J. Curtis Look Long Upon a Monkey 32: Yer supposed to walk on exercise, not bleedun run. Know what I mean? How many times you want telling, big-head? I’ll case you next time.

2. (US black) to joke about.

1971

H.E. Roberts Third Ear n.p.: case v. 1. to joke about another’s characteristics or foibles; e.g. He cased her at lunch.

3. (US black) to tell off, to scold.

1971		H.E. Roberts Third Ear n.p.: case v. […] 2. to reprove or reprimand sternly; e.g. His mother cased him for being late.
2002		(con. 1980s) i80s.com 🌐 Case as in ‘casing on a person.’ Meaning to insult.