cook up v.
1. [mid-18C; 1910s] to tamper with, to falsify; thus n. cook-up, an act of cheating.
2. [mid-18C+] to invent.
3. [mid-19C] to counterfeit, to forge.
4. [1920s] to happen, to develop.
5. to manufacture or prepare drugs.
(a) [late 19C–1960s] to prepare opium for smoking.
(b) [1920s–40s] (US Und.) to boil nitroglycerine out of dynamite.
(c) [1920s+] to prepare an injection of a narcotic drug, usu. heroin, by heating a measure of the powdered drug plus some water in a teaspoon or bottle cap.
(d) [1980s] to turn cocaine into freebase by heating it up [see freebase v.].
(e) [1980s+] to make crack cocaine from cocaine hydrochloride base.
(f) [1980s+] to manufacture methamphetamine.
6. [1900s] to make.
7. [1930s–50s] (US black) to enjoy oneself, to have a good time [cook v.1 (16)].
[20C+] (drugs) to prepare a pipe of opium.
[1960s] (US) to advocate enthusiastically.
[1950s] (US) to defeat comprehensively.
[1980s+] (US campus) to ‘neck’ with, to pet.