Green’s Dictionary of Slang

monster n.

1. [1920s–70s] (US) a large and formidable car or plane.

2. [1950s+] (US) an outstanding person, thing, achievement or success.

3. [1960s] (US campus) a difficult course or examination.

4. in drug uses.

(a) [1970s+] (drugs) any exceptionally powerful drug.

(b) [1990s+] (US drugs) methedrine.

5. [1990s+] an obsessive, an addict.

6. [2000s] (US prison) HIV/AIDS.

7. [2000s] cocaine.

SE in slang uses

In compounds

Monster Mansion (n.)

[2000s] (UK Und.) a prison housing sex offenders and other extreme offenders.

In phrases

make a monster of (v.)

[late 16C–early 17C] to cuckold.